Chronic migraines are a type of headache that occurs 15 or more days per month for at least three months. They can cause severe pain, often accompanied by symptoms such as nausea, vomiting, and sensitivity to light and sound. These headaches can last from a few hours to several days, significantly impacting daily activities. The exact cause of chronic migraines is not fully understood, but they may be linked to genetic factors, environmental triggers, and changes in brain chemistry. Treatment options include medications for pain relief and preventive measures, as well as lifestyle changes to help manage symptoms and reduce the frequency of attacks.