Secondary hypertension is more common in preadolescent children, with most cases caused by renal disease. Primary or essential hypertension is more common in adolescents and has multiple risk factors, including obesity and a family history of hypertension.
Midge (family Chironomidae), also called chironomid, nonbiting midge, or gnat, any of a group of tiny two-winged flies (order Diptera) that superficially resemble mosquitoes. Although they resemble mosquitoes, midges are harmless, with small mouthparts that are not elongated into a piercing structure for blood feeding. They do not have scales on wings or body, and the pattern of wing veins differs from that of mosquitoes. The male antennae are feathery.
Midges live in the sand and mud of swampy waterways and mangroves. They are very small and even though they do look like a fly, they are too small to see their wings; they look like a small piece of fine dark cut hair, so this makes them difficult to see. Because they are so small, they can easily fly through normal fly screens.