1 Two-part, three-part and four-part fractures can occur. 2  The fractures are then classified by their degree of displacement and angulation. 3  Surgical neck fractures are the most common type of proximal humeral fracture.
About 1.8 million people in the United States experience allergies to tree nuts, the Food Allergy and Anaphylaxis Network reports. Like other tree nuts, walnuts can cause a range of unpleasant reactions.
Histamines cause the skin, digestive and respiratory symptoms generally associated with allergies. Fewer than 10 percent of tree nut allergy sufferers outgrow their condition, according to the American College of Allergy, Asthma and Immunology.