Yeah, the severe headache will possibly cause the black eye for you. As we know, the black eyes are usually caused by the lack of sleep, stay up late at night, bad emotion and so on. Once you have the severe headache, the nerves in the body will be in disorder. You may even can't sleep well at night. And the blood circulation around the body is not worked that well. And you may not raise your good mood when your head hurts. All those direct action from the headache may cause you to have the black eyes. If so, I suggest you to go to see the doctor to treat the headache firstly. Try to keep the calm mood and go to sleep at the regular time which may let you avoid the black eyes.
Yes, a severe headache can cause the black eyes. As we know that black eye is a result of bruising of the skin. In most cases, black eye is not a major injury and it can be cured after a week or two. There are many factors which can cause black eyes, for example, facial surgical procedures, bites, allergies and so on. So you should pay attention to them. But on the other hand, if you have severe headache and it also lead to black eyes, maybe you should be alarm. In this situation, you'd better go to the hospital as soon as possible.
No, ii don't believe that headache can cause a black eye. A black eye is a bruise, there is bleeding in his/her face. This can't be caused by headache unless he hit his head or get a elbow. Anyway, you'd better suggest him to visit an eye doctor to treat his eyes to release his black eye and headache. Good luck.
Yes, it could cause that if you have got the head injury. Black eyes are a kind of eye problems that directly relate to injury to the face or head, which would occur when blood and other fluids collect in the space around the eye to cause swelling and dark around the eyes. Most black eyes are relatively minor injuries, however, sometimes they indicate a more serious injury. Headache might also be present because the usual cause of a black eye is some sort of head injury.