What causes the scalp to feel numb or tingly?

Tingling of the scalp may be caused by several factors: 1. **Excessive fatigue**: Tingling of the scalp is generally caused by excessive fatigue, such as staying up late, irregular作息 patterns, or overexertion, all of which may lead to abnormal brain nerve function and cause this symptom. It may also be accompanied by body weakness. 2. **Exposure to cold**: If the head is exposed to cold temperatures, it may cause abnormalities in the head's nerve tissues and blood circulation, leading to tingling of the scalp. This may also be accompanied by symptoms such as runny nose or headache. 3. **Medication ingredients**: Certain medication components may inhibit the brain's nerves after entering the body, causing tingling of the scalp. Examples include hormonal medications and blood pressure-regulating drugs. 4. **Medical conditions**: Tingling of the scalp could be caused by underlying diseases, such as cervical spondylosis, brain tumors, diabetes, or hypertension. These conditions may damage the sensory nerves, resulting in tingling sensations, and may also be accompanied by symptoms like headache or dizziness. 5. **Skin conditions**: Scalp eczema, dermatitis, or other skin disorders may also cause a tingling sensation. 6. **Vitamin B12 deficiency**: Malnutrition, especially a deficiency in vitamin B12, can impair nervous system function and result in tingling or numbness.