1.The reason for dry lips in summer is water shortage and dehydration in the body. In summer, because of evaporation and heat dissipation, more sweat is discharged from the body, and different degrees of dehydration will occur when sweat is discharged and water is not replenished in time. In summer, excessive essential vitamins and trace elements will be discharged with sweat, and in the absence of B vitamins in the body, such as vitamin B2, there will be dry and cracked lips and popped skin, so there is a direct correlation between dry and cracked lips and the lack of B vitamins in the body. 3. In summer, patients with previous primary diseases, such as hyperthyroidism and diabetes, are especially prone to anion imbalance, which can lead to clinical symptoms such as dry and cracked lips and body weakness, and at this time, a large amount of warm water, sugar and salt water or appropriate B vitamins can alleviate the above symptoms.