Why do I feel dizzy and weak in the legs when I get up in the morning?

Generally, dizziness and leg weakness upon waking in the morning may be caused by insufficient sleep, improper sleeping posture, orthostatic hypotension, hypoglycemia, anemia, or other factors. Symptomatic management through general treatment and medication may be necessary. If symptoms are severe, timely medical consultation and adherence to medical advice are recommended. Detailed analysis is as follows:

1. Insufficient Sleep

Chronic late nights, fatigue, excessive mental stress, or autonomic nervous system disorders in daily life may lead to insufficient sleep, which can cause symptoms such as dizziness and fatigue, including morning dizziness and leg weakness. It is recommended to maintain a regular sleep schedule, ensure sufficient sleep duration, and avoid staying up late.

2. Improper Sleeping Posture

Prolonged incorrect sleeping posture, especially leg compression, may cause muscle ischemia and hypoxia, typically resulting in leg weakness and fatigue upon waking. Legs may tremble while walking, and a heavy feeling in the legs is common. It is recommended to improve sleeping posture—for example, choose a supine position, use a pillow of appropriate height, and select a mattress of moderate firmness.

3. Orthostatic Hypotension

Orthostatic hypotension refers to a rapid drop in blood pressure upon standing or sitting up, leading to insufficient blood supply to the brain and causing dizziness and leg weakness. Symptoms typically resolve spontaneously within seconds or minutes. It is recommended to change positions slowly when getting up and avoid sudden standing.

4. Hypoglycemia

Hypoglycemia is mainly caused by inadequate food intake or excessive blood sugar reduction. During hypoglycemia, energy supply to the brain and muscles decreases. On an empty stomach, blood glucose levels may drop further, causing dizziness and leg weakness, possibly accompanied by sweating, tremors, and hunger. It is recommended to follow medical advice to use medications such as glucose sodium chloride injection, hydrocortisone tablets, or mannitol injection to alleviate symptoms.

5. Anemia

Poor nutrition, excessive blood loss, or impaired hematopoietic function may lead to anemia. In anemic conditions, the blood's oxygen-carrying capacity decreases, depriving the brain and muscles of sufficient oxygen, which may cause dizziness and leg weakness upon waking. Symptoms may include pallor, palpitations, and shortness of breath. It is recommended to follow medical guidance for treatment with medications such as compound ferrous sulfate granules, iron dextran tablets, or iron sucrose injection.

It is advised not to get up immediately after waking; instead, lie in bed for a few minutes, move the limbs slightly, and then sit up slowly to avoid discomfort caused by sudden postural changes and blood pressure fluctuations.