Sweating is a perfectly normal bodily function, and individual variations exist among people. For instance, those who are heavier tend to sweat more, while those who are slimmer sweat less—both fall within the normal range. It is crucial to distinguish between physiological sweating and pathological sweating. Pathological sweating, also known as hyperhidrosis, is fundamentally a manifestation of central nervous system dysfunction.Traditional Chinese Medicine attributes sweating to imbalances in yin and yang. Regardless of weather—whether hot, cool, or even in winter—some individuals sweat profusely, sometimes drenched in sweat. Even minor activity or eating can cause them to sweat profusely, with perspiration covering their entire body. What causes excessive sweating?
Sweating falls into two categories:
(1) A normal physiological phenomenon during metabolic processes.
1.During childhood growth and development, metabolism is vigorous, producing relatively more heat and waste, resulting in more sweat than adults. 2. Children's nervous systems are not yet fully developed. The sympathetic nerves controlling sweat gland secretion lose brain control during sleep, leading to temporary excitement and increased sweating. This typically subsides within two to three hours. It is more common in children aged 3–6 and gradually diminishes with age.(2) Pathological Hyperhidrosis. Medicine classifies sweating into categories such as spontaneous sweating, night sweats, cranial sweating, hemispheric sweating, and palmar-plantar sweating. The most common types are spontaneous sweating and night sweats. Spontaneous sweating refers to unprovoked, involuntary sweating, typically occurring during daytime in non-hot environments without physical activity.Night sweats are defined medically as sweating that occurs during sleep at night and ceases upon waking. Of course, many other sweating conditions are also classified. Some cases of spontaneous sweating and night sweats are medically considered pathological, associated with certain diseases. Sometimes they are related to central nervous system disorders. Spontaneous sweating is linked to various diseases, such as febrile illnesses like fever, pneumonia, and rheumatic fever.
Additionally, endocrine disorders like menopausal syndrome and metabolic conditions such as hyperthyroidism can contribute. General medical conditions like hypoglycemia in diabetes or oxygen deprivation during coronary heart disease episodes may also cause sweating. Certain medications, including aspirin, can induce sweating. Thus, the causes of spontaneous sweating are diverse.In children, rickets caused by calcium deficiency can lead to excessive night sweats during sleep, accompanied by irritability, easy startling, prominent forehead, and delayed teething. Anemia, rheumatic diseases, and malnutrition can all cause increased sweating. This may be triggered by febrile illnesses, metabolic disorders, or psychological factors.
Hypoglycemia: May cause pallor, cold sweats, and trembling hands and feet.
Hyperthyroidism: Patients experience heat intolerance and excessive sweating, along with increased appetite, weight loss despite eating more, frequent bowel movements, palpitations, and nervousness.
Diabetes: Often accompanied by autonomic neuropathy, leading to abnormal sweating. Patients may also experience polyphagia, polydipsia, polyuria, and weight loss.
Pheochromocytoma: Common symptoms include profuse sweating, often paroxysmal or persistent. May also present with palpitations, hand tremors, cold extremities, and marked blood pressure elevation during episodes.Additionally, individuals with hypertension and menopausal women may also experience hyperhidrosis.
Spontaneous sweating: Often occurs during the day, worsening with activity. Primarily caused by qi deficiency or yang deficiency, it can be regulated with warming and tonifying agents.
Night sweats: Sweating occurs after falling asleep and ceases upon waking. Commonly seen in individuals with yin deficiency and excessive heat, or those with chronic illnesses, particularly prevalent in tuberculosis patients.Nasal Sweating: Occurs during emotional agitation, mental stress, work fatigue, or excessive talking, with perspiration seeping from the bridge and sides of the nose. Common in allergic rhinitis and individuals with weakened immunity prone to colds. Forehead Sweating: Limited to the forehead region, sometimes resembling steam rising from a steamer. Often seen in those with excessive yang energy and hyperactive digestive function.
Hemiplegic sweating: Refers to excessive sweating on one side of the body while the opposite side remains dry or produces minimal sweat. Common in young patients with hypertensive encephalopathy, renal hypertension, stroke, hemiplegia, or paraplegia. Hemiplegic sweating may result from conditions like hemiplegia causing limb imbalance or paraplegia. Traditional Chinese Medicine attributes this to impaired qi and blood circulation and obstructed meridians.
Heart-related sweating: Refers to excessive sweating in the solar plexus area and between the breasts, often caused by excessive worry, overthinking, fright, or fear damaging the heart and spleen. Common among intellectuals who overwork mentally.
Perineal sweating: Sweating confined to the perineum and external genitalia, commonly seen in gynecological conditions like vulvar pruritus and vaginitis. May also produce odorous perineal sweat.
Bromhidrosis: Sweat emits a fox-like odor due to abnormal apocrine gland secretion in the armpits. Common in young and middle-aged adults, more prevalent in women than men.
Unilateral Head Sweating: Sweating occurs only on one side of the head, with the opposite side completely dry. This results from sexual intercourse after severe illness, causing dual deficiency of yin and yang and susceptibility to cold.
Palmar and plantar sweating: Often occurs during tension, excitement, or public speaking, typically beginning in adolescence and frequently triggered by psychological stress.
What causes excessive sweating? The above provides a brief overview. If you experience any of these symptoms, seek prompt medical evaluation to avoid delaying treatment.