Chills when pooping: what to know

A bowel movement can briefly affect the autonomic nervous system, especially if you strain, have cramps or pass a large stool. That response may cause sweating, nausea, light-headedness or shivering and often improves after you sit or lie down. Constipation, diarrhoea and rectal pain can make the response more noticeable.

Chills with burning urination, side or back pain, or fever can occur when a urinary tract infection has reached the kidneys. Influenza and pneumonia can also present with chills and general illness, while malaria or dengue fever should be considered after relevant travel or mosquito exposure. Sepsis is an emergency possibility when infection is accompanied by rapid deterioration, confusion or breathing difficulty. The bowel movement itself does not show which condition is present.

Stop straining and give yourself time. Drink fluids, add fibre gradually if stools are hard, and keep a note of stool changes, pain, temperature and urinary symptoms. Stand slowly if you feel faint. If diarrhoea is present, replace fluids and salts with small frequent drinks. Avoid taking laxatives or anti-diarrhoeal medicines repeatedly without advice, because the right choice depends on the cause.

Arrange prompt medical care for repeated episodes, fever, persistent abdominal or back pain, painful urination, vomiting, blood or black stool, or symptoms that do not settle. Seek emergency help for fainting, confusion, severe weakness, difficulty breathing, cold clammy skin or rapidly worsening illness. Chills after travel to a malaria area, or after a mosquito bite with fever, also warrant prompt assessment. Do not drive yourself if you feel faint or confused.

Ask whether constipation, diarrhoea, infection or a medication could explain the episode; whether urine or stool testing is needed; and which warning signs should prompt same-day care. Share travel history, temperature readings and any pattern linked to straining.