What is Sweating Spells?
Sweating spells—also referred to as hyperhidrosis episodes or paroxysmal sweating—are sudden bursts of profuse sweating that occur without a clear environmental trigger such as heat or exercise. These episodes can happen at any time of day, often last from a few minutes to an hour, and may affect the whole body (generalized) or be confined to specific areas (focal). While occasional night sweats are common, recurrent or severe spells can signal an underlying medical condition and merit evaluation.[1][2]
Common Causes
Sweating spells are a symptom rather than a disease. Below are the most frequently encountered conditions that can trigger them:
- Hormonal Imbalance – Menopause, thyroid disorders (hyperthyroidism), and adrenal abnormalities (e.g., pheochromocytoma).
- Infections – Tuberculosis, HIV, endocarditis, and viral illnesses such as influenza or COVID‑19.
- Medications – Antidepressants (SSRIs, SNRIs), antipyretics (aspirin), opioids, and antidiabetic drugs (insulin, sulfonylureas).
- Neurologic Disorders – Parkinson’s disease, autonomic dysreflexia, and spinal cord injuries.
- Cardiovascular Events – Myocardial infarction, angina, and severe arrhythmias.
- Metabolic Conditions – Diabetes mellitus (especially hypoglycemia), carcinoid syndrome, and pheochromocytoma.
- Oncologic Causes – Lymphoma, leukemia, and certain solid tumors that secrete cytokines.
- Psychological Stress – Panic attacks, anxiety disorders, and post‑traumatic stress disorder (PTSD).
- Substance Use – Caffeine, nicotine, alcohol withdrawal, and illicit stimulants (e.g., cocaine, methamphetamine).
- Primary Hyperhidrosis – A benign condition where sweat glands are over‑active, often familial.
Associated Symptoms
Sweating spells rarely occur in isolation. The following signs frequently accompany them and can help narrow the underlying cause:
- Fever or chills
- Palpitations or rapid heart rate (tachycardia)
- Chest pain or discomfort
- Shortness of breath
- Dizziness, light‑headedness, or fainting
- Weight loss or unexplained appetite changes
- Night sweats that soak clothing or bedding