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HLH is an immune deficiency disorder which happens when certain types of white blood cells, known as histiocytes and lymphocytes, become overactive and attack the body.

For example, in addiction treatment, therapies might aim to dampen overactive dopamine signaling while boosting serotonin activity.

Tufts of black lambswool and recycled nylon sprout up in contrast to the conventional ribbed beanie brim, an homage to the overactive crown chakra that is every Sagittarian’s secret weapon and downfall.

For people with an overactive bladder, the acidity might also aggravate the urinary system.

About 80% of people with an overactive thyroid gland have it.