1. People with severe hair loss or sparse hair: Hats may increase scalp burden, affect hair health, and easily expose scalp problems.
2. People with head skin diseases: Hats may exacerbate skin inflammation, which is not conducive to disease recovery, and may also cause discomfort due to friction.
3. Infants and young children: The head development of infants and young children is not yet fully developed, and wearing hats for a long time may affect head heat dissipation and blood circulation, and even affect brain development.
4. People with severe headaches or migraines: Hats may compress nerves or blood vessels in the head, exacerbating headache symptoms.