Why do I feel dizzy and see black spots when getting up in the summer?

Generally, dizziness and vision darkening upon waking in summer may be caused by insufficient sleep, dehydration, orthostatic hypotension, hypoglycemia, anemia, or other reasons. Symptomatic treatment such as general care and medication may be needed. If discomfort occurs, it is advisable to visit a hospital for examination and treatment as soon as possible. Detailed analysis is as follows:

1. Insufficient Sleep

Due to the hot weather and numerous mosquitoes in summer, inadequate sleep at night may lead to excessive fatigue of the brain and abnormal nervous system function, resulting in symptoms such as dizziness, vertigo, and vision darkening. It is recommended to maintain a cool and comfortable indoor environment, ensure sufficient sleep, avoid staying up late, and reduce the frequency of late nights appropriately.

2. Dehydration

The hot summer weather can cause excessive sweating and fluid loss. If adequate hydration is not maintained before bedtime, symptoms of dehydration such as dizziness, fatigue, vision darkening, thirst, dry skin, and reduced urine output may appear upon waking. It is advisable to slowly replenish warm water after waking to increase blood volume and alleviate symptoms of dizziness and vertigo.

3. Orthostatic Hypotension

When suddenly standing up from a lying position, gravity causes blood to flow to the lower limbs and abdomen, reducing venous return to the heart and temporarily lowering blood pressure, which can cause dizziness, vision darkening, weakness, and a feeling of fainting while standing. It is recommended to change positions slowly when getting up and avoid sudden standing.

4. Hypoglycemia

Decreased appetite and food intake in summer, combined with high energy consumption from physical activity, may lead to reduced blood glucose levels, causing dizziness and vision darkening upon waking, along with symptoms such as hunger, palpitations, and sweating. It is recommended to eat regular meals with appropriate portion sizes and, under a doctor's guidance, use medications such as glucose sodium chloride injection, hydrocortisone tablets, or mannitol injection to relieve symptoms.

5. Anemia

Excessive sweating in summer can lead to iron loss, and insufficient dietary iron intake may cause anemia, which in turn can result in dizziness and vision darkening upon waking. Additional symptoms may include pale complexion, fatigue, weakness, and palpitations. It is recommended to increase dietary intake of iron-rich foods and, as directed by a physician, use medications such as compound ferrous sulfate granules, iron dextran tablets, or iron sucrose injection to alleviate symptoms.

It is also advised to move slowly when getting up, sit on the edge of the bed for a few minutes after waking to allow the body to adjust to positional changes, and avoid sudden movements that may cause dizziness.