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There are 3 names in this directory beginning with the letter H.
Hemorrhoids
Nodular enlargements of the rectal blood vessels, which can even bulge out toward the anus. There are various causes like obesity, pressing hard during a bowel movement and lack of exercise.

Hyaluron Acid
Hyaluron acid is the basis of most conventional dermatological fillers. It is a naturally occurring substance in all tissue, for instance the eyeball is filled with hyaluron acid. Hyaluronic acid fillers feature excellent tissue compatibility and hardly ever cause allergic reactions. The degree of molecular density determines the viscosity and shelf life of the various hyaluronic acid products.

Hyposensitisation
Is the term used for acclimatising an allergy sufferer to an allergen like, for example, pollen. This can be achieved with injections, pills or drops.