Kidney stones have a reputation for being one of the most painful experiences a person can go through — and if you've ever had one, you probably agree. But beyond the infamous pain, kidney stones come with a whole range of symptoms that can be confusing, alarming, or easy to mistake for something else entirely. Whether you're trying to figure out if what you're feeling might be a kidney stone or you just want to be better prepared, this FAQ breaks down the most common questions people have about kidney stone symptoms.
What Does Kidney Stone Pain Actually Feel Like?
Kidney stone pain is often described as one of the most intense types of pain a person can experience, sometimes compared to the pain of childbirth or a stab wound. It typically starts suddenly and can hit in waves rather than staying constant. The pain usually originates in the back or side, just below the ribs, and radiates downward toward the lower abdomen and groin as the stone moves through the urinary tract. The technical term for this is renal colic, and it's caused by the stone creating pressure and irritation as it travels. The pain can fluctuate in intensity, making it easy to think it's getting better before it surges back with full force.
Where Exactly Does It Hurt?
The location of the pain shifts depending on where the stone is in your urinary tract. When a stone is still in the kidney or upper ureter, you'll typically feel pain in your flank — the side of your back between your ribs and your hip. As it moves lower into the ureter, the pain often travels to the lower abdomen and pelvis. When the stone approaches the bladder, some people feel discomfort or pressure in the groin and inner thighs. If you notice your pain moving around over time, that's actually a sign the stone is progressing through your system.
Is Blood in Urine a Common Symptom?
Yes, and it's one of the hallmark signs of a kidney stone. Blood in the urine — medically called hematuria — occurs because the stone scrapes and irritates the delicate lining of the urinary tract as it moves. In some cases, the blood is visible to the naked eye, turning the urine pink, red, or brownish. In other cases, it's microscopic and only detectable through a urine test. If you notice any discoloration in your urine alongside flank or abdominal pain, it's a strong reason to get checked out by a healthcare provider promptly.
Can Kidney Stones Cause Nausea and Vomiting?
Absolutely. Nausea and vomiting are surprisingly common with kidney stones, and they're not just a side effect of the pain being unbearable — though that's part of it. The kidneys and the gastrointestinal tract share nerve pathways, so intense kidney pain can trigger nausea through a reflex response. This is the same reason that appendicitis and kidney issues can sometimes feel similar. If you're vomiting during a kidney stone episode, it can also make it harder to stay hydrated and pass the stone naturally, which is one reason doctors sometimes need to intervene.
What Does It Feel Like to Urinate With a Kidney Stone?
Urinary symptoms are very common with kidney stones, especially once the stone reaches the lower part of the ureter near the bladder. You might feel a frequent and urgent need to urinate, even when there's very little urine to pass. Urination can be painful, producing a burning or stinging sensation similar to a urinary tract infection. Some people experience difficulty starting urination or feel like they can't fully empty their bladder. If the stone is partially blocking the ureter, urine flow can be slowed or interrupted entirely, which is a more serious situation requiring medical attention.
Can You Have a Kidney Stone Without Any Pain?
Yes, and this surprises a lot of people. Small kidney stones that haven't moved into the ureter can sit in the kidney for a long time without causing any noticeable pain. These are sometimes called "silent" kidney stones and are often discovered incidentally during imaging done for an unrelated reason, like an abdominal CT scan. That said, just because a stone isn't causing pain right now doesn't mean it won't become a problem later. If a silent stone starts moving, the symptoms can appear quickly and intensely.
Is Fever a Symptom of a Kidney Stone?
Fever on its own isn't a direct symptom of a kidney stone, but it becomes a major concern when it appears alongside stone symptoms. A fever combined with kidney stone pain and chills is a red flag for a kidney infection, also known as pyelonephritis, which can develop when a stone blocks urine flow and creates a breeding ground for bacteria. This combination — stone pain plus fever plus chills — is a medical emergency and requires immediate care. A blocked, infected kidney can lead to sepsis if not treated urgently, so don't wait to seek help if you develop a fever during a kidney stone episode.
How Do Kidney Stone Symptoms Differ From a UTI?
Kidney stones and urinary tract infections can share overlapping symptoms, including painful urination, frequent urges to urinate, and cloudy or foul-smelling urine, which can make it tricky to tell them apart without a proper evaluation. The key differences tend to lie in the severity and location of pain. UTIs usually cause a burning sensation during urination and lower abdominal discomfort, but they don't typically produce the severe, wave-like flank pain that kidney stones are known for. Blood in the urine is possible with both conditions, but hematuria in the absence of a burning sensation leans more toward a kidney stone. A urine test and imaging are usually needed to confirm the diagnosis either way.
When Should You Go to the Emergency Room?
Not every kidney stone requires an ER visit, but there are clear warning signs that mean you shouldn't wait. Head to the emergency room if you're experiencing severe pain that you can't manage at home, if you develop a fever or chills alongside the pain, if you're vomiting so much that you can't keep fluids down, or if you notice a complete inability to urinate. People with a single kidney, kidney disease, or a compromised immune system should also seek care sooner rather than later. Even if your situation seems less urgent, calling your doctor or a nurse line to describe your symptoms is always a smart move when you're unsure.
