Definition
Night sweats are repeated episodes of very heavy sweating during sleep, heavy enough to soak your nightclothes or bedding. They’re often caused by an underlying condition or illness.
Sometimes you may wake up after sweating heavily, particularly if you’re sleeping under too many blankets or your bedroom is too warm. Although uncomfortable, these episodes aren’t usually considered night sweats and aren’t sign of an underlying condition or illness.
Night sweats usually happen with other concerning symptoms, such as fever, weight loss, pain in a specific area, cough or diarrhea.
Causes
Medications that can cause night sweats
Causes of night sweats include medication such as:
Depression medications (antidepressants)
Hormone therapy
A drug used to treat opioid use disorder (methadone)
Drugs used to treat low blood sugar with diabetes (hypoglycemic agents)
Conditions that can cause night sweats
Causes of night sweats include conditions and illnesses such as:
Alcohol use disorder
Anxiety disorders
Autoimmune disorders
Autonomic neuropathy (damage to your autonomic nerves)
Brucellosis (a bacterial infection)
Carcinoid tumors (a type of neuroendocrine tumor)
Drug addiction (substance use disorder)
Endocarditis (an infection of the inner lining of the heart)
HIV/AIDS
Hodgkin lymphoma (Hodgkin disease)
Hyperthyroidism (overactive thyroid)
Leukemia
Menopause
Myelofibrosis (a bone marrow disorder)
Non-Hodgkin’s lymphoma
Osteomyelitis
Pheochromocytoma (a rare adrenal gland tumor)
Pyogenic abscess (a pus-filled cavity caused by an infection)
Sleep disorders (such as obstructive sleep apnea)
Stroke
Syringomyelia (a fluid-filled cyst in the spinal cord)
Takayasu’s arteritis
Thyroid disease
Tuberculosis
Valley fever (coccidioidomycosis)
