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- Menopause. The hot flashes that accompany menopause can occur at night and cause sweating. This is a very common cause of night sweats in women.
- Idiopathic hyperhidrosis. Idiopathic hyperhidrosis is a condition in which the body chronically produces too much sweat without any identifiable medical cause.
- Infections. Tuberculosis is the infection most commonly associated with night sweats. But bacterial infections, such as endocarditis (inflammation of the heart valves), osteomyelitis (inflammation in the bones), and abscesses can cause night sweats. Night sweats are also a symptom of HIV infection.
- Cancers. Night sweats are an early symptom of some cancers. The most common type of cancer associated with night sweats is lymphoma. However, people who have an undiagnosed cancer frequently have other symptoms as well, such as unexplained weight loss and fevers.
- Medications . Taking certain medications can lead to night sweats. Antidepressant medications are a common type of drug that can lead to night sweats. From 8% to 22% of people taking antidepressant drugs have night sweats. Other psychiatric drugs have also been associated with night sweats. Medicines taken to lower fever, such as aspirin and acetaminophen, can sometimes lead to sweating. Many other drugs can cause night sweats or flushing.
- Hypoglycemia. Low blood sugar can cause sweating. People who are taking insulin or oral diabetes medications may have hypoglycemia at night that is accompanied by sweating.
- Hormone disorders. Sweating or flushing can be seen with several hormone disorders, including pheochromocytoma, carcinoid syndrome, and hyperthyroidism.
- Neurologic conditions. Uncommonly, neurologic conditions including autonomic dysreflexia, posttraumatic syringomyelia, stroke, and autonomic neuropathy may cause increased sweating and may lead to night sweats.