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.
While enjoying walnuts is fine for most people, those with tree nut allergies should avoid them. There's no doubt that people with obvious and sometimes severe symptoms -- such as skin rashes, hives, swelling and wheezing -- should avoid these nuts, but allergies can also be more generalized.