Not only before covid vaccine shots, it is always best to mention all the details to the doctor. Specifically before vaccination, tell your healthcare provider about all of your medical conditions, including- 1. If you ever experienced a severe allergic reaction (also known as an anaphylactic reaction) after any drug, food, any vaccine or any ingredients of covishield vaccine. 2. If you have a fever. 3. If you have a bleeding disorder or you are on a blood thinner. 4. If you are Immunocompromised (having weak immunity)or you are under any medication that affects your immune system. 5. If you are carrying (that is who are already pregnant) 6. If you are breastfeeding mother 7. If you have already received another covid 19 vaccine. You are advised to consult with your healthcare provider before deciding to take the vaccine.