I have had 4 cta head scans and one abdominal ct scan , im 39 years old . am i at risk of cancer?

Your risk for having these procedures is not measurably greater than your baseline risk. Have a healthy diet, exercise 30 minutes/day, drink plenty of water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs. For nutrition: http://www.choosemyplate.gov/. Get HPV and Covid vaccines. Wish you good health!

The 5 procedures provide each modest amounts of radiation and would be highly unlikely to provoke a neoplastic response.