The side effects depend on the vaccine you take. If you are taking Covishield, you will see mild side-effects such as headache, fatigue, deep muscle pain, malaise, fever, chills and joint pain and nausea. If you are taking Covaxin then you will see pain and swelling where injected, headache, fatigue, fever, body ache, abdominal pain, nausea and vomiting, dizziness-giddiness, tremor, sweating, cold and cough.