No, a flu shot cannot give you the flu. Flu vaccines that are administered with a needle are currently made in two ways: the vaccine is made either with a) flu vaccine viruses that have been ‘inactivated’ and are therefore not infectious, or b) with no flu vaccine viruses at all (which is the case for recombinant influenza vaccine). In randomized, blinded studies, where some people got flu shots and others got saltwater shots, the only differences in symptoms was increased soreness in the arm and redness at the injection site among people who got the flu shot. There were no differences in terms of body aches, fever, cough, runny nose or sore throat.
Finally, doctors find clues in the recent activities patients engage in by asking a battery of questions to gauge allergy information. For example, to determine whether your reaction is a result of food, airborne or chemical allergens, the doctor might ask, "Have you eaten anything unusual recently?", "Have you been working or exercising vigorously outdoors?" or "Did you come into contact with anything which might have irritated your skin and eyes?" Your doctor will likely ask if you suffer from asthma , since allergies increase the risk of an asthma attack.