 [ Symptoms ] can cheratussin be given to a 4 year old [ Disease ] not likely since you have been on this thyroid medication for over a year look for other reasons yes it can be related my thyroid was removed in 1973 when i was 21 yrs old due to benign adenoma i took armour for 10 yrs then switched to synthroid for 10 yrs in 1991 i began having severe hives and red burned face my family dr immediately suspected thyroid meds allergists insisted no way was it that i suffered for 8 months until my gynecologist took me off synthroid hives immediately began subsiding then on armour and hives returned but looked different took me off all hormone for 6 weeks and follow up with endocrinologist said i would feel very tired   but i felt great all my levels were normal and have remained so for 21 yrs