evidence: - Fussiness, crying, restlessness, or decreased appetite in infants - [...] Have a positive experience. [...] Some people have wondered if vaccines can cause conditions such as autism, asthma, and SIDS or autoimmune diseases like diabetes and multiple sclerosis. However, there is no evidence that vaccines cause these conditions. We learn about a vaccine’s safety during clinical trials before it is approved and monitor it continually as millions of doses are administered after its approval. We’ve been monitoring the safety of vaccines for more than 50 years, and the chance a vaccine will cause unanticipated long-term health problems is extremely low.