Reading can give a person a headache for a variety of reasons. Some common causes of reading-induced headaches include eyestrain, muscle tension, and dehydration.

One reason reading can cause a headache is eyestrain. When a person reads, they are focusing on small text for an extended period of time, which can strain the muscles in the eyes. Eyestrain can cause a headache, as well as other symptoms such as dry eyes, blurred vision, and fatigue.

Another reason reading can cause a headache is muscle tension. When a person reads, they may hold their head and neck in a fixed position, which can lead to muscle tension in the neck, shoulders, and back. This muscle tension can cause a headache.

In addition, reading can cause a headache due to dehydration. When a person reads, they may become engrossed in the text and forget to drink water or other fluids. Dehydration can cause a headache, as well as other symptoms such as thirst, fatigue, and dizziness.

To prevent reading-induced headaches, it is important to take breaks from reading and to engage in activities that relax the eyes and muscles. It is also important to stay hydrated by drinking plenty of fluids. If a headache persists despite these precautions, it is recommended to consult with a healthcare provider for further evaluation and treatment.