Why do I sweat on my head but feel weak all over?

Under normal circumstances, sweating on the head accompanied by general weakness may be caused by overexertion, kidney yin deficiency, hypoglycemia, insufficient cerebral blood supply, or hyperthyroidism. Treatment should be based on the specific cause. Detailed explanations are as follows:

1. Overexertion

When a patient engages in high-intensity physical activity for prolonged periods, excessive fatigue may lead to autonomic nervous system dysfunction, resulting in various physical symptoms such as spontaneous sweating, dizziness, and fatigue—potentially causing the aforementioned condition. If no other adverse symptoms occur, it is generally recommended to rest adequately and drink fluids appropriately, which usually leads to gradual improvement.

2. Kidney Yin Deficiency

Kidney yin deficiency typically results from depletion of kidney yin fluids and may be associated with factors such as chronic overwork or long-term illness damaging the kidneys. Patients may experience the above symptoms, along with additional signs like heat sensations in the palms, soles, and chest (five-center heat), tidal fever, and night sweats. In such cases, patients are advised to take medications such as Liuwei Dihuang Pills, Qiju Dihuang Pills, Baihe Gujin Pills, or Yangyin Qingfei Pills under medical guidance.

3. Hypoglycemia

This commonly occurs when fasting. Low blood glucose levels can trigger excessive activation of the autonomic nervous system, leading to symptoms such as sweating, weakness, and dizziness. During acute hypoglycemic episodes, the condition can be corrected by consuming sugary foods or oral glucose solutions.

4. Insufficient Cerebral Blood Supply

If intracranial blood vessels are narrowed, cerebral perfusion may be reduced, leading to ischemia and hypoxia in brain tissue, which may result in the symptoms described. Additional symptoms may include dizziness and excessive sleepiness. It is recommended that patients follow medical advice and use medications such as Yangxue Qingnao Granules, Naotai Capsules, or Xuesaitong Capsules for treatment.

5. Hyperthyroidism

Hyperthyroidism is caused by excessive secretion of thyroid hormones. Symptoms may include insomnia, vivid dreams, fatigue, decreased appetite, weight gain, and edema, potentially contributing to the aforementioned condition. Patients may take medications such as methylthiouracil tablets or propylthiouracil tablets under a doctor's supervision.

In summary, sweating on the head with generalized weakness may stem from multiple causes. Therefore, individuals experiencing these symptoms should seek timely medical evaluation and receive appropriate treatment based on the underlying condition.