What causes dizziness, headache, head heaviness, and mental fogginess?

Dizziness, headache, heaviness in the head, and mental fogginess may be caused by the following reasons: 1. Oxygen deficiency: Poorly ventilated environments or respiratory system diseases may lead to insufficient oxygen supply, resulting in a heavy feeling in the head and dizziness. 2. Fatigue and lack of sleep: Prolonged work or a stressful lifestyle can cause fatigue, and inadequate sleep may also contribute to these symptoms. 3. Dietary issues: Deficiency of essential nutrients such as vitamin B12, iron, and protein may lead to headaches and dizziness. 4. Migraine: Caused by abnormal neuronal activity, it may be accompanied by symptoms such as headache, dizziness, and visual disturbances. 5. Neurological disorders: Conditions such as stroke or Parkinson's disease may directly affect brain function, leading to symptoms like dizziness and headache.