Hand pain can be caused by disease or injury affecting any of the structures in the hand, including the bones, muscles, joints, tendons, blood vessels, or connective tissues. Hand pain is one feature of joint inflammation (arthritis) that may be felt in the hand.
Marijuana and the Eyes. Marijuana has a few key effects on the eyes. One of the most noticeable occurs shortly after smoking the drug: redness of eyes. THC in marijuana lowers blood pressure which dilates the blood vessels and increases blood flow throughout the body.
Since dry eye can cause physical discomfort, especially make the nerve around your eyes and brain hurt. Also, dry eyes can lead to eye strain, eye fatigue and muscle tension, which will cause headache too. What's more, squinting, computer use, reading too long can also sometimes lead to headache.