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Learn about your pain on one side, including causes and common questions. Or get a personalized analysis of your pain on one side from our A.I. health assistant. At Buoy, we build tools that help you know what’s wrong right now and how to get the right care.

Pain on One Side Checker

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Your Pain on One Side May Also be Known as:
Aches and pains in my left flank
Aches and pains in my left side
Aches and pains in my one flank
Aches and pains in my one side
Aches and pains in my right flank
Aches and pains in my right side
Left flank ache
Left flank discomfort
Left flank hurts
Left flank pain

Top 10 Pain on One Side Causes

  1. 1.Kidney Stone

    A kidney stone is a solid piece of material that forms in the kidney from substances in the urine. Most kidney stones pass out of the body without help from a doctor. But sometimes a stone will not go away. It may get stuck in the urinary tract, block the flow of urine and cause great pain.

    Kidney stones can be painful, so go to the nearest urgent care center or emergency room. The course of treatment depends on the size of the stone. Small stones can pass out of the body without any treatment, which can take two days to four weeks. You can help this process by drinking plenty of water to increase the flow of urine. Strong painkillers can also help with the pain. If a stone is stuck in a tube (ureter), your doctor might recommend a medication called an alpha-blocker, which can help make the tube bigger and thus help the stone to pass.Larger stones might not pass on their own, and thus surgery or shock wave therapy might be used. Shock wave therapy uses shock waves to break up stones into small pieces that can pass out of the body.

    Rarity:
    Uncommon
    Top Symptoms:
    nausea, abdominal pain that comes and goes, diarrhea, pelvis pain, vomiting
    Symptoms that always occur with kidney stone:
    hidden: abdomen or flank pain
    Urgency:
    Hospital emergency room
  2. 2.Kidney Infection (Pyelonephritis)

    Pyelonephritis is the medical term for a kidney infection. This can arise as a result of a bladder infection that travels upstream. A kidney infection is usually bacterial in nature, and can cause pain on the side of the stomach, high fever, nausea, and blood in the urine.

    You should visit your ER. Pyelonephritis is caused by bacteria and, therefore, needs to be treated with prescription antibiotics.

    Rarity:
    Uncommon
    Top Symptoms:
    abdominal pain (stomach ache), nausea, pelvis pain, back pain, fever
    Symptoms that never occur with kidney infection (pyelonephritis):
    mid back pain from an injury
    Urgency:
    Hospital emergency room
  3. 3.Urinary Tract Infection

    In women, the opening to the urethra (the tube that carries urine from the bladder to the outside of the body) is very close to the anus, and bacteria from the anus can easily escape and travel up the urethra. These bacteria can infect the bladder, and cause what is known as a urinary tract infection (UTI).

    You should go to your doctor, an urgent care, or a walk-in clinic to be treated. UTIs must be treated with antibiotics. It is important to get treated as soon as possible to avoid the infection from becoming worse and spreading. To prevent future UTIs, urinate frequently, wipe from front to back, and urinate after sex to rinse out bacteria.

    Rarity:
    Common
    Top Symptoms:
    abdominal cramps (stomach cramps), pelvis pain, sudden urgency to urinate, urinary changes, abdominal pain (stomach ache)
    Symptoms that always occur with urinary tract infection:
    hidden: urinary changes: atrophy or inflammation
    Urgency:
    Phone call or in-person visit
  4. 4.Iga Nephropathy

    Nephropathy is damage, disease, or other problems with the kidney. IgA nephropathy, also known as Berger's disease, is a kidney disorder in which antibodies called IgA build up in kidney tissue. This results in local inflammation that may over time hinder the kidney's ability to filter out waste, excess water, and electrolytes (salts) from the blood.

    You should visit your primary care physician. IgA nephropathy is treated with blood pressure medications, omega-3 fatty acids, immunosuppressants, and cholesterol-lowering medications (statins). In rare, progressed cases, dialysis or kidney transplant may be necessary.

    Rarity:
    Rare
    Top Symptoms:
    side pain, bilateral leg swelling, pink/blood-tinged urine, dark brown urine, groin pain
    Urgency:
    Primary care doctor
  5. 5.Abdominal Aortic Aneurism

    The aorta is the main blood vessel to everything below the neck. Weaknesses can happen within the wall of the aorta, which balloons out due to the pressure of the blood pushing against it.

    Seek immediate medical care at an ER. An aortic aneurysm may rupture at any time, which is a life-threatening condition due to blood loss. Radiologic imaging will be performed by a medical professional to assess the size of the aneurism and plan the surgical intervention. A non-ruptured abdominal aortic aneurism must be treated surgically as soon as possible.

    Rarity:
    Rare
    Top Symptoms:
    lower back pain, side pain, general abdominal pain, abdominal bump, abdominal pain that shoots to the back
    Urgency:
    Hospital emergency room

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  6. 6.Acute Costochondritis (Chest Wall Syndrome)

    Costochondritis is an inflammation of the cartilage that connects a rib to the breastbone. Pain caused by costochondritis may mimic that of a heart attack or other heart conditions.

    You can safely treat this condition on your own by taking over-the-counter pain relief medications such as acetaminophen (Tylenol) or ibuprofen (Motrin, Advil). Local heat or ice compress can also improve symptoms.

    Rarity:
    Uncommon
    Top Symptoms:
    rib pain, chest pain that is worse when breathing, chest pain, rib pain when moving, pain when pressing on the chest
    Urgency:
    Phone call or in-person visit
  7. 7.Ovarian Torsion

    The twisting, or torsion, of the ovary around its surroundings. This may result in loss of blood to both the ovary and the fallopian tube. When diagnosed, this condition is considered an emergency and requires immediate surgery.

    You should go to the emergency room immediately. Diagnosis is made by ultrasound and surgery is required if the diagnosis is confirmed.

    Rarity:
    Rare
    Top Symptoms:
    abdominal pain (stomach ache), nausea or vomiting, nausea, moderate abdominal pain, abdominal cramps (stomach cramps)
    Symptoms that never occur with ovarian torsion:
    diarrhea, pain below the ribs, mild abdominal pain
    Urgency:
    Hospital emergency room
  8. 8.Viral (Norovirus) Infection

    Noroviruses are a group of related viruses that leads to nausea, vomiting, diarrhea, and cramps. These viruses cause gastroenteritis, an inflammation of the stomach and intestines. When the diarrhea and/or vomiting is severe, dehydration can occur. Symptoms of dehydration include a dry mouth, dizziness, urinating less frequently and dark urine.

    You can safely treat this condition at home. Make sure you drink plenty of water and fluids (Gatorade, Pediatlyte) to replace what is lost with diarrhea. If symptoms of dehydration occur or you are unable to keep down any liquids, seek care at your primary care physician or an urgent care.

    Rarity:
    Common
    Top Symptoms:
    fatigue, abdominal pain (stomach ache), nausea, headache, stomach bloating
    Symptoms that always occur with viral (norovirus) infection:
    hidden: gastroenteritis symptoms
    Symptoms that never occur with viral (norovirus) infection:
    severe abdominal pain, throbbing headache, severe headache, tarry stool
    Urgency:
    Self-treatment
  9. 9.Bladder Cancer

    The bladder is a hollow organ in your lower abdomen that stores urine. Bladder cancer, which occurs in the lining of the bladder, is the sixth most common type of cancer in the United States.

    You should visit your primary care physician who will coordinate your care with a cancer specialist (oncologist). Early bladder cancer is usually confined to the superficial lining, and treatment is for the most part easy and curative.

    Rarity:
    Rare
    Top Symptoms:
    abdominal pain (stomach ache), constipation, pelvis pain, frequent urination, side pain
    Urgency:
    Primary care doctor
  10. 10.Viral (Rotavirus) Infection

    Rotavirus is a virus that causes an infection of the gut, known as gastroenteritis. Symptoms include diarrhea, vomiting and fever. When the diarrhea and/or vomiting is severe, dehydration can occur. Symptoms of dehydration include a dry mouth, dizziness, urinating less frequently and dark urine.

    You can safely treat this condition at home. Make sure you drink plenty of water and fluids to replace what is lost with diarrhea. Eat as normally as possible. If symptoms of dehydration occur, or you are unable to keep down any liquids, seek care at your primary care physician or an urgent care.

    Rarity:
    Rare
    Top Symptoms:
    fatigue, nausea, abdominal pain (stomach ache), headache, loss of appetite
    Symptoms that always occur with viral (rotavirus) infection:
    hidden: gastroenteritis symptoms
    Symptoms that never occur with viral (rotavirus) infection:
    constipation, tarry stool
    Urgency:
    Self-treatment

Questions Your Doctor May Ask About Pain on One Side

  • Q.How long has your side been hurting?
  • Q.Any fever today or during the last week?
  • Q.Have you experienced any nausea?
  • Q.Do you feel pain when you urinate?

If you've answered yes to one or more of these questions, check our pain on one side symptom checker.

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Pain on One Side Symptom Checker Statistics

  • People who have experienced pain on one side have also experienced:

    • 4% Nausea
    • 4% Rib Pain on One Side
    • 3% Abdominal Pain (Stomach Ache)
  • People who have experienced pain on one side had symptoms persist for:

    • 43% Less Than a Day
    • 28% Less Than a Week
    • 14% Over a Month
  • People who have experienced pain on one side were most often matched with:

    • 37% Kidney Stone
    • 25% Kidney Infection (Pyelonephritis)
    • 8% Urinary Tract Infection

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    Pain on One Side Checker

    Take a quiz to find out why you’re having pain on one side.

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