Hyperaemia refers to increased blood flow in certain bodily organs. Conjunctival hyperaemia occurs during eye inflammation (conjunctivitis). With conjunctivitis, histamines are released into the blood, which causes capillaries to expand. Consequently the conjunctiva becomes reddened. Conjunctival hyperaemia can be associated with allergy, mechanical damage to the cornea or bacterial or viral infections. Those suffering from conjunctival hyperaemia can experience burning, itching and intraocular pressure.