A subconjunctival hemorrhage appears as a bright red or dark red patch on the sclera. Most of them are spontaneous without an obvious cause for the bleeding from normal conjunctival blood vessels. Because they are painless, maybe you can only discover it by looking in the mirror. It is noticed by another person seeing a red spot on the white of your eye. However, there are some occasionally result in a spontaneous subconjunctival hemorrhage, which include sneezing, coughing, vomiting, eye rubbing or inserting contact lenses, or increasing the pressure in the veins of the head, as in weight lifting. And medical disorder can cause bleeding or inhibiting normal clotting.
Well, generally speaking, there are many causes which can lead to a subconjunctival hemorrhage, which is similar to an ordinary bruise on the skin. Also we can say that it's like a bruise of the eye. And for the causes, it is hard to say. While an injury to the eye or a head injury can be the cause. Of course, you should know that sometimes they occur after a bout of coughing or vomiting. Besides, they are associated with high blood pressure. If you have a bleeding disorder, you may be more prone to having a subconjunctival hemorrhage, and even nose bleeds or easy bruising be the cause too. To treat them, you do not need medical cares. In my opinion, you can just put some cool teabags on your eyes, and then have a good rest. And they can disappear in a week.
Subconjunctival hemorrhage means that the small blood vessels in conjunctival breaks and a bright red or dark red patch on the sclera appears. Sneezing, coughing, straining, increasing the veins of the head, eye rubbing or inserting contact lenses, conjunctivitis, bleeding or inhibiting normal clotting caused by medical disorder and a severe eye infection can cause subconjunctival hemorrhage. When you have an abnormally large blood vessel in your eyes, you should go to see a doctor to check whether you have subconjunctival hemorrhage or not.