describe 1. Migraine headaches

2. Tension headaches
3. Sinus headaches
4. Cluster headaches
5. Dehydration
6. Pre-eclampsia
7. Hypertension
8. Anemia
9. Cervicogenic headache
10. Medication side effects
11. Allergies
12. Mental health issues such as anxiety or depression
13. Hormonal changes
14. Chiari malformation
15. Brain tumor (rare but possible)

1. Migraine headaches are a type of severe headache that can cause throbbing pain, often on one side of the head. They are often accompanied by other symptoms such as nausea, vomiting, and sensitivity to light and sound.

2. Tension headaches are a common type of headache characterized by a dull, constant ache that typically affects both sides of the head. They are often triggered by stress, poor posture, or muscle tension in the neck and shoulders.

3. Sinus headaches are headaches that occur when the sinus cavities become inflamed, usually due to allergies or a sinus infection. They are typically accompanied by facial pain, pressure, and congestion.

4. Cluster headaches are an extremely painful type of headache that occur in clusters or groups, usually around the same time each day or night. They often cause intense pain around one eye, as well as nasal congestion and tearing.

5. Dehydration can cause headaches due to a loss of fluids and electrolytes in the body. Not drinking enough water can lead to dehydration, which can trigger headache symptoms.

6. Pre-eclampsia is a pregnancy complication characterized by high blood pressure and signs of damage to other organs, often including headaches. These headaches can be severe and persistent, and may signal a serious medical emergency.

7. Hypertension, or high blood pressure, can also cause headaches as a symptom of increased pressure on the blood vessels and nerves in the brain. Chronic hypertension can lead to more frequent and severe headaches.

8. Anemia, a condition characterized by a lack of healthy red blood cells, can lead to headaches due to reduced oxygen flow to the brain. Anemia-related headaches are often described as throbbing or dull.

9. Cervicogenic headaches are headaches that originate from issues in the neck, such as muscle tension or cervical spine problems. These headaches typically cause pain at the base of the skull that radiates to the forehead.

10. Medication side effects can sometimes include headaches as a common symptom. Certain medications, such as blood pressure medications, birth control pills, and antidepressants, can trigger headaches in some individuals.

11. Allergies can cause headaches as a result of sinus congestion and inflammation. Allergic reactions to pollen, dust, or certain foods can trigger headaches, along with other allergy symptoms.

12. Mental health issues such as anxiety or depression can also contribute to headaches, as stress and emotional distress can trigger physical symptoms including headache pain.

13. Hormonal changes, such as fluctuations in estrogen levels during menstruation, pregnancy, or menopause, can trigger headaches in some individuals. Hormonal headaches are often linked to migraine symptoms.

14. Chiari malformation is a structural defect in the brain where the cerebellum extends into the spinal canal, putting pressure on the brain and spinal cord. Headaches, often described as severe and persistent, are a common symptom of this rare condition.

15. Brain tumor is a rare but possible cause of headaches, especially if the tumor is pressing on the brain or surrounding structures. Headaches caused by a brain tumor may be severe, frequent, and often accompanied by other neurological symptoms.