Subconjunctival hemorrhage is mainly caused by 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. If you have hypertension or diabetes, you can easily get subconjunctival hemorrhage because of high blood sugar concentration or chronic elevated blood pressure which results in the fragility of blood vessel. And if you often take any anticoagulant medications like aspirin or warfarin or blood thinning herbs, you will easily have subconjunctial hemorrhage as well. You can take vitamin C and grape seed to strengthen your blood vessels and get rid of subconjunvtial hemorrhage. If the condition is getting worse, you should see ophthalmologist to ask for help.
You may use hand to rub your eyes for the sake of uncomfortable of the eyes, or cough when you crying. It is not a serious disease that it would be healed by itself for one to two weeks. Eye drops and vitamin C supplement will help to heal it. Excessive eyes use and eyes fatigue or lack of sleep will lead to dry eyes. Avoid rubbing eyes when you get dry eyes to induce angiorrhexis of your eyes blood. What cause the subconjunctival hemorrhage? There mainly has three reasons, please find follows, 1. Partial slight injury: e.g. rub your eyes with strength because of the allergic conjunctivitis or dry eyes. Suspend breath by constipation, parturition, weight lift; or severe cough. 2. High blood pressure, diabetes mellitus or cardiovascular disease especially happen in the aging people.
3. Acute conjunctivitis. Check your habits of eyes use, to avoid the wrong way to treat your eyes, the disease will go away. Take care!
Well, it is very hard to say why you keep getting subconjunctival hemorrhage, for they are very normal to have, and they can be harmless, even no treatments are needed. For your situation, I can just give some possibility which can lead to subconjunctival hemorrhage. For example, some injury to the eyes can lead to them. In addition, sometimes they occur after a bout of coughing or vomiting. High pressure is also an essential factor. So you should not do some activities which can increase your blood pressure, or it can cause subconjunctival hemorrhage. To relieve your symptom, you can just put some cool teabags on your eyes, and then have a good rest. And they can disappear. Anyway, they are harmless.