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Hypertrichosis can be congenital or acquired. The acquired condition is usually caused by an illness or drugs. Illnesses that might cause this condition are hypothyroidism, malnutrition, AIDS, dermatomyositis (a connective tissue disease), and porphyria cutanea tarda (a condition involving enzymes).
Osteoarthritis and overloading of the joint are the most common causes of facet hypertrophy. The most common cause of overloading is degenerative disc disease, which causes the disc. height to shrink and consequently the bony components of the facet joint to place increasing pressure on each other.