Headache on left side of head can be caused by migraine, vasculitis, cluster headaches, or other headache types. A headache is frequently treatable at home with over-the-counter medications and remedies.
A tension headache is the most common type of headache. It can cause mild, moderate, or intense pain behind your eyes and in your head and neck. A tension headache can feel like a tight band around your forehead.
Red eyes could be generally unharmful and are readily treated at home. However, you must seek medical attention right away if the red eye is accompanied by swelling, eye pain, light sensitivity, or blurred vision.