Symptom guide

Flank or kidney painPehlu ya kidney ka dard

Pain in the side or back, just under the ribs, is often blamed on the kidney. Sometimes it is, and sometimes it comes from a muscle, the spine or another organ. This guide explains the common causes, which patterns point to the kidney, how doctors find the reason, what to do next, and when to go to hospital.

Pasliyon ke neeche pehlu ya peeth ke dard ko aksar kidney ka kehte hain. Kabhi yeh kidney ka hota hai, aur kabhi patthay, reerh ya kisi aur ungh se. Yeh guide aam wajohat, kaun se andaaz kidney ki taraf ishara karte hain, doctor wajah kaise dhoondte hain, ab kya karna hai, aur hospital kab jana hai, samjhati hai.

On this pageIs safhay par

Yeh alamat kya hai

Flank jism ke dono taraf neechli pasliyon aur koolhay ke darmiyan ka hissa hai, jo peeth tak jata hai. Kidney ka dard aam tor par is hissay mein gehraai mein, aik taraf mehsoos hota hai, aur ran ki taraf ya pait ke saamne tak phail sakta hai. Yeh tez, shadeed dard ho sakta hai jo lehron mein aaye, ya halka dard jo tikta rahe. Saath mein matli, ulti, bukhar, peshab mein jalan, ya peshab mein khoon ho sakta hai.

Pehlu ka dard kahan se shuru ho sakta hai, aur dard ke mukhtalif andaaz kya ishara dete hain Do tasveerein. Baayen taraf peshab ka nizam saamne se: do kidneys, do ureters aur bladder, aur sunehri nuqtay kidney, ureter ke saath aur bladder par jahan dard shuru ho sakta hai. Daayen taraf dard ke teen andaaz: pehlu se ran tak lehron mein aane wala dard pathri ka ishara ho sakta hai, bukhar ke saath halka dard infection ka, aur aik taraf musalsal halka dard rukawat ya kidney ki soojan ka. Dard kahan se shuru ho sakta hai Dard ka andaaz Kidney Ureter (bladder takjaane wali nali) Bladder Saamne se bani hui. Kidneys reerh ki haddike dono taraf, oopar hoti hain. Lehron mein, pehlu se ran tak Bukhar ya kapkapi ke saath halka dard Aik taraf musalsal halka dard Aksar aaram nahi milta.Pathri ka ishara ho sakta hai. Aksar jalan ya bimari ke ehsaas ke saath.Kidney infection ka ishara ho sakta hai. Hafton tak aata jata reh sakta hai.Rukawat ya soojan ka ishara ho sakta hai. Bukhar ke saath dard mein usi din madad lein.Andaaz aik ishara hai, tashkhees nahi.
Aasaan tasveer. Dard kidney, ureter, ya bladder se shuru ho sakta hai. Sunehri nuqtay dikhate hain kahan se. Daayen taraf dard ke teen aam andaaz aur un ke ishare hain.

Is hissay ka har dard kidney se nahi hota, aur kidney ki har bimari dard nahi karti. Kidney ki kuch sanjeeda bimariyan bilkul dard nahi karti, is liye alamat aik ishara hai, tashkhees nahi.

Aam wajohat

Yeh kisi bhi umar mein ho sakta hai, auraton, mardon aur bachon mein. Kidney aur peshab ki nalion ki aam wajohat yeh hain:

  • Kidney ya ureter ki pathri. Achanak shadeed dard ki sab se aam wajah. Dard aksar lehron mein aata hai, pehlu se ran tak phail sakta hai, aur matli, ulti aur peshab mein khoon ke saath ho sakta hai (dekhein kidney stones guide).
  • Kidney ka infection. Is se pehlu ya peeth mein dard hota hai, aam tor par bukhar, kapkapi aur bohat bimar mehsoos hone ke saath, aksar peshab ki jalan ke baad ya saath (dekhein urine infection guide).
  • Kidney ki rukawat ya soojan. Rukawat se halka dard ho sakta hai, jo bohat paani peene ke baad barh sakta hai. Yeh pathri, us jagah ke tang hone se jahan kidney ureter se judti hai (dekhein PUJ obstruction guide), barhi hui prostate ya doosri wajohat se ho sakti hai. Rukawat kidney ko khamoshi se nuqsan pohancha sakti hai, is liye isay dhoondna zaroori hai.
  • Kidney ki cyst. Cysts aam hain aur aksar nuqsan nahi deti. Kam hi, bari cyst ya us mein khoon aanay se dard hota hai.
  • Kidney ka tumour. Yeh kam aam wajah hai, aur zyadatar kidney tumours bade hone tak dard nahi karte. Musalsal dard, peshab mein khoon, ya pehlu mein gaanth ko scan ke baghair kabhi bhi patthay ke khinchaao par nahi dalna chahiye (dekhein kidney cancer guide).
  • Khoon ka lothra jo kidney se khoon behne ke baad ureter mein se guzarta hai.
  • Chot kidney ko girne, sarak hadsay ya pehlu ya peeth par waar ke baad.

Agar dard shadeed ho, bukhar ke saath ho, ya aap ki sirf aik kidney kaam karti ho, to meherbani karke intezar na karein.

Jab dard kidney se nahi hota

Is hissay ke bohat se dard kidney se nahi hote. Aise ishare jo batate hain ke yeh kuch aur ho sakta hai:

  • Patthay ya reerh ka dard. Yeh aksar harkat, jhukne ya position badalne se badalta hai, aur dabane par dukhta hai. Yeh bhaari cheez uthane ya be-dhang harkat ke baad ho sakta hai. Kidney ka dard, jaise pathri ka, position badalne se aam tor par kam nahi hota.
  • Dabi hui nas ya sciatica, jis mein dard tang tak jata hai ya jhunjhunahat hoti hai.
  • Shingles, jis mein aik taraf jalan wala dard hota hai, aur chand din baad chhaalon wale daane nikalte hain.
  • Pitta, jigar, aanten ya appendix, jo seedhi ya ultee taraf ya peeth mein dard kar sakte hain, aksar khaane, hajat ya pait dabane par dard se juray hue.
  • Phephray ya seena, agar saans andar lene par dard barhe, ya khansi ya saans phoolne ke saath ho.
  • Aurton mein bachedani ya rahm, khaas tor par agar dard neeche ho ya mahwari ya hamal se juda ho.

In wajohat ke aik jaise nazar aane ki wajah se doctor ko muaina karna aur faislay se pehle peshab ka test karna pad sakta hai. Agar peshab ka test aur kidneys ka scan normal ho, to doosri wajohat dhoondi jati hain.

Jaanch aam tor par kaise hoti hai

Aap ke doctor poochhenge ke dard kab shuru hua, kaisa hai, kya hilta hai, kya bukhar, ulti, jalan ya peshab mein khoon hai, kya pehle pathri ho chuki hai, aur kya aap ko kidney ki bimari, diabetes ya sirf aik kidney hai. Woh aap ka pait aur peeth dekhenge. Aam tests yeh hain:

  • Peshab ka dipstick test, jaldi hone wala patti ka test jo khoon ya infection ki nishaniyan dikhata hai. Aksar yeh pehla test hota hai.
  • Peshab ka culture, agar infection ka shak ho, taake germ aur kaam karne wali antibiotics maloom hon.
  • Khoon ke tests, kidney ke kaam aur infection ya sozish ki nishaniyon ke liye.
  • Kidneys aur bladder ka ultrasound, aik mehfooz scan jis mein radiation nahi hoti aur jo kidney ki soojan, bohat si pathriyan aur cysts dikhata hai.
  • Peshab ke nizam ka CT scan, jo pathri aur achanak shadeed dard ki wajah dhoondne ka sab se durust test hai.
  • Aisa scan jo dikhata hai har kidney kitni achhi tarah nikaasi karti hai (renogram), agar aahista rukawat ka shak ho.
  • Doosre scans ya tests, agar dard kidney se aata nazar na aaye.

Agar aap shadeed dard mein hon, to pehle dard ka ilaaj kiya jata hai, aur tests us ke baad hote hain.

Fauran madad kab lein

Agar pehlu ya kidney ka dard ho aur in mein se koi bhi ho to fauran qareebi hospital ke emergency department jayein:

  • Bukhar, kapkapi, ya bohat bimar mehsoos karna. Aisi kidney jo band bhi ho aur infected bhi, emergency hai aur jaldi jaan ko khatra ban sakti hai.
  • Shadeed dard jo painkillers se kam na ho, ya baar baar ulti jis se aap paani na rok sakein.
  • Aap peshab nahi kar pa rahe, ya bohat kam kar rahe hain (dekhein urinary retention guide).
  • Aap ki sirf aik kidney kaam karti hai, kidney transplant hai, ya kidney ki lambi bimari hai.
  • Zyada khoon behna ya peshab mein mote lothray.
  • Girne, hadsay ya waar ke baad dard pehlu ya peeth par.
  • Chakkar aana, rang peela parhna, paseena ya girr jana, ya peeth ya pait mein achanak shadeed dard, khaas tor par kisi umar rasida shakhs mein. Yeh kidney ke bahar ka masla ho sakta hai jis ko bhi fauri ilaaj chahiye.
  • Seene mein dard ya saans mein dushwari.
  • Aap hamila hain aur pehlu ya peeth mein dard, bukhar ya khoon behna ho.
  • Shair khwar ya chhota bachcha jise dard, bukhar ya ulti ho, ya jo aam tarah peshab nahi kar raha.

Halka ya mand pehlu ka dard in mein se kisi ke baghair emergency department ki zaroorat nahi rakhta, lekin jaldi jaanch zaroori hai. Meherbani karke ghar par ilaaj jari na rakhein agar yeh baar baar aaye.

Ab kya karein

  • Doctor ko dikhayein, aur peshab ka sample dein. Agar dard shadeed ho to usi din jayein.
  • Aam tarah paani peeyein. Zabardasti bohat zyada paani peena pathri ko nahi nikalta aur band kidney ka dard barha sakta hai.
  • Aam painkillers mashwaray ke mutabiq lein. Apne doctor ya pharmacist se poochhein ke aap ke liye kaun si mehfooz hai: kuch painkillers kidneys ko nuqsan pohancha sakti hain, khaas tor par jab jism mein paani ki kami ho, ulti ho, ya kidney ki bimari ho.
  • Garam sek dard wali jagah par takleef kam kar sakta hai.
  • Agar aap koi pathri jaisi cheez nikalein, use saaf dibbe mein rakhein aur doctor ke paas lein. Is ki jaanch se pata chalta hai ke yeh kis cheez ki bani hai aur aur pathriyan rokne mein madad milti hai.
  • Andaaz note karein: kab shuru hua, kya lehron mein aata hai, kya cheez behtar ya buri karti hai, aur peshab mein koi tabdeeli. Pehle ke scans aur reports saath layein.
  • Lamba chalne wala halka dard nazar andaaz na karein, chahe halka ho. Peshab ke test aur ultrasound ke liye kahein.
  • Har qism ka tambaku chhor dein. Yeh kidney cancer ke wazeh tareen khatron mein se hai, aur chhorna hamesha aap ki kidneys aur aam sehat ke liye achha hai.
  • Urologist ko dikhayein agar aap ko pathri ho chuki hai, dard baar baar aaye, peshab mein khoon ho, ya scan mein kidney ki soojan, cyst ya gaanth nazar aaye.

Aam sawalaat

Main kaise jaanun ke dard kidney ka hai ya peeth ke patthay ka?

Aap khud pakka nahi keh sakte. Patthay ka dard aksar harkat ya position se badalta hai aur dabane par dukhta hai. Pathri ka dard lehron mein aata hai aur harkat se kam nahi hota. Kidney infection mein bukhar hota hai. Peshab ka test aur kabhi scan faisla kar deta hai.

Kya kidney ke dard ka matlab hai ke meri kidneys kharab ho rahi hain?

Aam tor par nahi. Zyadatar dard aik taraf ki pathri, infection ya rukawat se hota hai, aur doosri kidney kaam karti rehti hai. Lekin rukawat kidney ko khamoshi se nuqsan pohancha sakti hai, is liye isay dhoondna aur ilaaj karna zaroori hai.

Kya pathri khud nikal jati hai?

Bohat si chhoti pathriyan paani aur painkillers se khud nikal jati hain. Bari pathriyan, bukhar ya infection wali pathriyan, aur kidney ko band karne wali pathriyan aksar ilaaj mangti hain. Scan ke baad aap ke doctor batayenge ke aap ke liye kya sahi hai. Dekhein kidney stones guide.

Kya mujhe bohat paani peena chahiye ya pathri ke jari booti nuskhay lene chahiyein?

Itna paani peena ke peshab halka rahe pathri se bachne mein madad deta hai. Lekin shadeed dard ke dauran zabardasti zyada paani peena madad nahi karta. Pathri ghulane ke jari booti aur desi nuskhay bharosemand nahi, aur kuch kidneys ko nuqsan pohancha sakte hain. Meherbani karke pehle doctor ko dikhayein.

Dono taraf dard hai. Kya yeh kidneys hain?

Ho sakta hai, maslan dono taraf infection ya pathri se, lekin dono taraf ka dard zyada tar patthon ya reerh se hota hai. Agar bukhar, peshab mein khoon ya ulti ke saath ho, to meherbani karke jaldi dikhayein.

Kya mere pehlu ka dard cancer ho sakta hai?

Yeh kam aam wajah hai, aur zyadatar kidney tumours bade hone tak dard nahi karte. Lekin musalsal dard, peshab mein khoon, ya pehlu mein gaanth ko scan chahiye aur is ko scan ke baghair kabhi patthay ka khinchaao nahi samajhna chahiye. Zyadatar pehlu ka dard pathri, infection ya patthay se hota hai, lekin hum sanjeeda wajohat pehle dekhte hain taake woh chhoot na jayein.

Dard khud theek ho gaya. Kya phir bhi jaanch chahiye?

Agar dard shadeed tha, ya khoon, bukhar ya ulti ke saath tha, to haan. Ho sakta hai pathri hili ho lekin nikli na ho, aur kidney ka masla khamosh reh sakta hai. Peshab ka test aur ultrasound aasaan hain aur karwane chahiyein.

Mere bachay ko pehlu ya peeth mein dard ki shikayat hai. Kya fikr karni chahiye?

Meherbani karke bachay ko jaldi doctor ko dikhayein, aur bukhar, ulti ya kam peshab ho to fauran. Bachon mein peshab ke infection aur rukawat kidneys ko mutasir kar sakti hain, aur bachcha sirf yeh keh sakta hai ke pait ya peeth mein dard hai.

What this symptom is

The flank is the area on either side of the body between the lower ribs and the hip, reaching round to the back. Kidney pain is usually felt deep in this area, on one side, and it can spread towards the groin or the front of the tummy. It may be a sharp, severe pain that comes in waves, or a dull ache that stays. It may come with nausea, vomiting, fever, burning when passing urine, or blood in the urine.

Where flank pain can start, and what different patterns of pain can suggest Two drawings. On the left, the urinary system seen from the front: two kidneys, two ureters and the bladder, with gold dots at the kidney, along the ureter and at the bladder where pain can start. On the right, three pain patterns: pain that comes in waves from the side to the groin can suggest a stone, a dull ache with fever can suggest infection, and a steady dull ache on one side can suggest a blockage or swelling of the kidney. Where the pain can start Pattern of pain Kidney Ureter (the tubeto the bladder) Bladder Drawn from the front. The kidneys sithigh, either side of the spine. Comes in waves, side to groin Dull ache with fever or chills Steady dull ache on one side Often cannot get comfortable.Can suggest a stone. Often with burning or feeling unwell.Can suggest a kidney infection. May come and go over weeks.Can suggest a blockage or swelling. Pain with fever needs same-day help.A pattern is a clue, not a diagnosis.
Simplified drawing. Pain can start in the kidney, along the ureter, or in the bladder. Gold dots show where. The right side shows three common patterns and what each can suggest.

Not every pain in this area is from the kidney, and not every kidney problem causes pain. Some serious kidney conditions cause no pain at all, so the symptom is a clue, not a diagnosis.

Common causes

It can happen at any age, in women, men and children. Common causes from the kidney and urine tubes are:

  • A kidney or ureteric stone. This is the most common cause of sudden severe pain. The pain often comes in waves, can spread from the side to the groin, and may come with nausea, vomiting and blood in the urine (see the kidney stones guide).
  • A kidney infection. This causes pain in the side or back, usually with fever, chills and feeling very unwell, often after or with burning when passing urine (see the urine infection guide).
  • A blocked or swollen kidney. A blockage can cause a dull ache, which may be worse after drinking a lot. It can come from a stone, a narrowing where the kidney joins the ureter (see the PUJ obstruction guide), an enlarged prostate or other causes. A blockage can damage the kidney silently, so it is worth finding.
  • A kidney cyst. Cysts are common and usually harmless. Rarely, a large cyst or a bleed into one causes an ache.
  • A kidney tumour. This is a less common cause, and most kidney tumours cause no pain until they are large. A persistent ache, blood in the urine, or a lump in the side must never be put down to muscle strain without a scan (see the kidney cancer guide).
  • A blood clot passing down the ureter after bleeding from the kidney.
  • An injury to the kidney after a fall, a road accident or a blow to the side or back.

If the pain is severe, comes with a fever, or you have only one working kidney, please do not wait and see.

When the pain is not from the kidney

Many pains in this area do not come from the kidney. Clues that it may be something else are:

  • Muscle or spine pain. It often changes with movement, bending or a change of position, and may be tender when pressed. It can come after lifting or an awkward movement. Kidney pain such as stone pain does not usually ease when you change position.
  • A trapped nerve or sciatica, with pain that runs down the leg or tingling.
  • Shingles, which causes burning pain on one side, followed by a blistering rash a few days later.
  • The gallbladder, liver, bowel or appendix, which can cause pain in the right or left side or back, often linked with food, bowel habit or tummy tenderness.
  • The lungs or chest, if the pain is worse on breathing in, or comes with a cough or breathlessness.
  • The ovaries or womb in women, especially if the pain is lower down or linked to periods or pregnancy.

Because these causes can look alike, a doctor may need to examine you and run a urine test before deciding. If a urine test and a scan of the kidneys are normal, other causes are looked for.

How it is usually investigated

Your doctor will ask when the pain started, what it is like, whether it moves, whether you have a fever, vomiting, burning or blood in the urine, whether you have had stones before, and whether you have kidney disease, diabetes or only one kidney. They will examine your tummy and back. Usual tests are:

  • Urine dipstick test, a quick strip test that shows blood or signs of infection. It is often the first test.
  • Urine culture, if an infection is suspected, to find the germ and the antibiotics that will work.
  • Blood tests, to check kidney function and for signs of infection or inflammation.
  • Ultrasound of the kidneys and bladder, a safe scan with no radiation that shows swelling of a kidney, many stones and cysts.
  • CT scan of the urinary tract, which is the most accurate test for stones and for finding the cause of sudden severe pain.
  • A scan that shows how well each kidney drains (a renogram), if a slow blockage is suspected.
  • Other scans or tests, if the pain looks like it is not coming from the kidney.

If you are in severe pain, treatment for the pain is usually given first, and the tests follow.

When to seek urgent help

Go to the nearest hospital emergency department if you have flank or kidney pain and any of these:

  • Fever, shaking chills, or feeling very unwell. A blocked kidney that is also infected is an emergency and can become life-threatening quickly.
  • Severe pain that painkillers do not settle, or repeated vomiting so that you cannot keep fluids down.
  • You cannot pass urine, or pass very little (see the urinary retention guide).
  • You have only one working kidney, a kidney transplant, or long-term kidney disease.
  • Heavy bleeding or thick clots in the urine.
  • Pain after a fall, accident or blow to the side or back.
  • Feeling faint, pale, sweaty or collapsing, or sudden severe pain in the back or tummy, especially in an older person. This can be a problem outside the kidney that also needs urgent care.
  • Chest pain or difficulty breathing.
  • You are pregnant and have pain in the side or back, fever or bleeding.
  • A baby or young child with pain, fever or vomiting, or who is not passing urine normally.

Mild or dull flank pain without any of these does not need the emergency department, but it should be checked soon. Please do not keep treating it at home if it keeps coming back.

What to do next

  • See a doctor, and give a urine sample. If the pain is severe, go the same day.
  • Drink normally. Forcing very large amounts of water does not clear a stone and can make a blocked kidney more painful.
  • Use simple painkillers as advised. Ask your doctor or pharmacist which one is safe for you: some painkillers can harm the kidneys, especially if you are dehydrated, vomiting, or have kidney disease.
  • A warm pack on the painful area can ease the ache.
  • If you pass something that looks like a stone, keep it in a clean container and bring it to the doctor. Testing it shows what it is made of and helps prevent more.
  • Note the pattern: when it started, whether it comes in waves, what makes it better or worse, and any change in the urine. Bring any earlier scans and reports.
  • Do not ignore a dull ache that lasts, even if it is mild. Ask for a urine test and an ultrasound.
  • Stop all tobacco. It is one of the clearest risks for kidney cancer, and stopping always helps your kidneys and your general health.
  • See a urologist if you have had a stone, if the pain keeps coming back, if there is blood in the urine, or if a scan shows a swollen kidney, a cyst or a lump.

Common questions

How can I tell if the pain is from the kidney or a back muscle?

You cannot be sure on your own. Muscle pain often changes with movement or position and is tender to press. Stone pain tends to come in waves and does not ease when you move. Kidney infection comes with fever. A urine test and sometimes a scan settle it.

Does kidney pain mean my kidneys are failing?

Usually not. Most pain comes from a stone, an infection or a blockage on one side, and the other kidney keeps working. But a blockage can damage a kidney silently, so it needs to be found and treated.

Will a stone pass by itself?

Many small stones pass by themselves with fluids and painkillers. Larger stones, stones with fever or infection, and stones that block the kidney often need treatment. Your doctor will tell you which applies after a scan. See the kidney stones guide.

Should I drink lots of water or take herbal stone remedies?

Drinking enough to keep your urine pale helps to prevent stones. But forcing large amounts during severe pain does not help. Herbal and desi stone-dissolving remedies are not reliable, and some can harm the kidneys. Please see a doctor first.

Pain in both sides. Is that the kidneys?

It can be, for example with infection or stones on both sides, but pain in both sides is more often from the muscles or spine. If it comes with fever, blood in the urine or vomiting, please be seen soon.

Could my flank pain be cancer?

It is a less common cause, and most kidney tumours cause no pain until they are large. But a persistent ache, blood in the urine, or a lump in the side needs a scan and should never be put down to muscle strain without one. Most flank pain is from stones, infection or muscle, but we look for the serious causes first so they are not missed.

The pain went away by itself. Do I still need a check?

If it was severe, or came with blood, fever or vomiting, yes. A stone may have moved but not passed, and a kidney problem can stay silent. A urine test and an ultrasound are simple and worth doing.

My child complains of pain in the side or back. Should I worry?

Please take your child to a doctor soon, and straight away if there is a fever, vomiting or they are passing urine less. Urine infections and blockages in children can affect the kidneys, and a child may only say their tummy or back hurts.

Written and reviewed by Dr Mudassir Hussain, Consultant Urologist, FRCS (Urol) Eng, FCPS (Urol) Pak

Last reviewed: October 2026    Next review due: October 2028

Further reading from trusted organisations (free, in English):Mazeed parhne ke liye, mustanad idaaron ki taraf se (muft, angrezi mein):
EAU Patient Information: Kidney and ureteral stones
BAUS: Kidney stones

This guide gives general information and is not a substitute for advice from the doctor treating you.

Yeh guide aam maloomat deti hai aur aap ka ilaaj karne wale doctor ke mashwaray ka mutabadil nahi hai.