"Bad" diarrhea colors to watch for include red or black/tarry stools, indicating bleeding (lower GI for red, upper for black), and pale, white, or grey stools, which can signal liver, gallbladder, or pancreas issues, all warranting a doctor's visit. While green or yellow diarrhea can be from diet or mild issues, persistent dark red, black, or very pale/white diarrhea needs urgent medical attention.
Ask a healthcare professional if you're concerned about your stool color. If your stool is bright red or black — which may indicate the presence of blood — seek medical attention right away. Food may be moving through the large intestine too quickly, such as due to diarrhea.
The severity of diarrhea is determined by the size and number of stools passed within a period of time. Severe diarrhea means having more than 10 loose, watery stools in a single day (24 hours). Moderate diarrhea means having more than a few but not more than 10 diarrhea stools in a day.
Stools will often have a milky muddy water color which can be lemon yellow to milky white with a strong smell. The infection may be accompanied with a high-grade fever. If there are no complications, vomiting usually stops within the first 1~2 days, and diarrhea ceases within a week.
Contact your provider if you have diarrhea with:
Red flags for diarrhea needing immediate medical attention include blood or black, tarry stools, severe abdominal/rectal pain, high fever, signs of severe dehydration (dizziness, little/no urine, extreme thirst), confusion, or diarrhea lasting more than a couple of days. For children, also watch for no wet diapers for 3+ hours, no tears when crying, sunken eyes, or unusual sleepiness, while adults should see a doctor for nighttime diarrhea or worsening symptoms.
Symptoms include nausea, vomiting, fever, diarrhea, abdominal cramping, and pain. In severe cases, you may become dehydrated and have an electrolyte imbalance. Bacterial gastroenteritis is sometimes treated with antibiotics.
Gastroenteritis (stomach flu) often causes watery, frequent, green, yellow, or even whitish poop because food moves too fast through the gut, preventing normal pigment changes; green is common from bile, while pale/white can signal inflammation affecting bile, and dark, tarry, or bloody stools need urgent care for potential bleeding. While green/yellow is usually fine with other symptoms, see a doctor for persistent white, black, bloody, or if dehydration signs like dark urine appear.
Gastroenteritis, on the other hand, attacks your intestines, causing signs and symptoms such as: Watery, usually nonbloody diarrhea — bloody diarrhea usually means you have a different, more severe infection. Nausea, vomiting or both. Stomach cramps and pain.
Schedule a doctor's visit for an adult with these symptoms:
Diarrhea lasts more than two days without improvement. Excessive thirst, dry mouth or skin, little or no urination, severe weakness, dizziness or lightheadedness, or dark-colored urine, which could indicate dehydration.
Organ failure, primarily kidney failure (renal failure), is a major cause of diarrhea, stemming from toxin buildup and inflammation in the gut, but liver or intestinal issues (like inflammatory bowel disease or infections, often secondary to weakened immunity in kidney failure) can also cause it, with severe diarrhea worsening kidney function due to dehydration and electrolyte imbalance.
Explosive, or severe, diarrhea causes a person to pass liquid or loose stool more frequently and forcefully than regular diarrhea. Explosive diarrhea occurs when the rectum fills with more liquid and gas than it can hold. Passing the stool is often loud, due to the escaping gas.
Bacterial infections: In some cases, green stool can be a symptom of a bacterial infection, such as Salmonella or E. coli. Viral infections: Certain viral infections like norovirus (stomach flu) can cause changes in the color of your poop.
Stress prepares your body to handle challenging situations. It can affect how fast food moves through your gut, which can lead to constipation or diarrhea. Stress can also affect your digestion, and as a result, your body might absorb fewer nutrients from your food. This could contribute to yellow poop.
However, ulcerative colitis poop may end up changing color for a few reasons. Mucus and pus may cause stool to have more of a green color, Dr. Higgins says. And if there is blood somewhere in the digestive tract, it can cause your poop to be shiny and black, “like used motor oil,” Dr.
You have a stomach bug
Diarrhea from these infections can appear yellow when your body doesn't have time to absorb the bile in the stool, given the increased speed of your intestines. Common causes include: Viruses, such as norovirus and rotavirus (commonly called the “stomach flu”)
Excess bile acids entering the colon can cause the classic signs and symptoms of bile acid malabsorption (BAM), including watery stool, urgency and fecal incontinence. Although BAM has been associated with diarrhea for nearly 50 years, it remains an underrecognized and underdiagnosed cause of chronic diarrhea.
You should seek medical attention as soon as possible for diarrhea with these symptoms: Diarrhea lasting more than two days. Blood or pus in the stool. Severe abdominal pain.
The signs to see a doctor for acute diarrhea:
The best thing you can do is check in with your healthcare provider. Tell them your symptoms, especially if you have a fever, diarrhea or pain. Poop that's red or black is often most alarming as it could suggest bleeding (not always).
Six common signs of norovirus include sudden vomiting, watery diarrhea, stomach pain/cramps, nausea, headache, and muscle aches, often appearing 12-48 hours after exposure and lasting 1-3 days, leading to potential dehydration.
Both can cause abdominal symptoms. Bacterial and viral infections have similar symptoms, such as nausea, vomiting, and diarrhea, but a stool test may distinguish between them.
It's important to note that if diarrhea is caused by bacteria, your body needs to get rid of the bacteria first by letting diarrhea run its course. If they're taken too soon, anti-diarrheal medication can make symptoms worse and keep you from clearing the infection.
Many cases of acute diarrhoea are related to a bowel infection. This is usually caused by contaminated food or water. It is possible to avoid an illness by being very careful about food and fluid intake. This might be advice to follow when traveling.