There are such things as autoimmune diseases. One, lupus, is often considered 'being allergic to yourself' because it is basically your body fighting back against itself. You can break out in a rash, which does look like an allergic reaction. There it itching and hair loss associated with the condition and, again, those can come off like allergic reactions. It may not be an actual 'allergy to yourself', but it certainly presents itself in the same way.
No, it is not possible to be allergic to the 'menstrual hormones'. If you are female then those hormones are present throughout your menstrual cycle so if you were allergic you'd see symptoms at all times. These are natural hormones and part of your body, you can't be allergic to yourself.
Yes, only if you are actually allergic to collagen. It is possible to be allergic to collagen.
No, you cannot make yourself allergic to something. You either are highly allergic, mildly allergic, sensitive, or non-allergic to any substance. Chronic exposure by sensitive people to allergens by actually help to build immunity to the allergen itself.
No, it is not possible to be allergic to blood. Your immune system violently reacts to the allergens you are allergic to. If anyone were allergic to blood, they'd be dead by now. But it is possible to have a phobia of blood.
Yes
yes. i am allergic to the metal in the needles but the doctor does not know why.
It is possible to get hives if you overexert yourself while exercising. The main causes of hives are allergic reactions to insect bites or foods, stress, exercise, medications, and some medical conditions, such as an immune system disorder.
Yes
Yes
no, are you crazy?
Yes you canbe allergic to diamonds as well.
yes, it is possible to be allergic to anything.