Arthritis can be the result of an injury, infection, from simple wear and tear or autoimmune diseases. Previously, these conditions were called as rheumatism.
Food allergies are a defensive reaction of the immune system following ingestion of food or food additive that it recognizes as foreign material. Allergies are always caused by a reaction to proteins, unlike food intolerances.
Acne is a skin disease characterized by rash or superficial appearance of deeper lesions: blackheads, cysts, nodules, etc. The lesions are concentrated where the sebaceous glands are most numerous: face, neck, chest, upper back, shoulders and forearms.
Alopecia is defined as hair loss of hair, partial or total. Sometimes hairs grow back, but not always. It depends on the cause of the loss.
The word allergy is used to describe several kinds of reactions to substances that trigger an exaggerated response of the immune system. The asthma , hay fever, allergic rhinitis, some forms of urticaria and eczema (atopic eczema), the food allergy reaction and anaphylaxis are form of allergy.