Hormones regulate many functions: digestion, appetite, sleep, cognition, sex drive, metabilic rates, immune function.....and more. You should be aware that increasing or decreasing any of your natural hormone levels with exogenous hormones could impact any of these systems.
It's generally orals more than injectibles that can cause dyspepsia or acid reflux but some of the stronger injectibles can affect your GI motility and function.
Where are you injecting your steroids? How much and how often? What is your diet like currently and did it change at all as a result of starting your cycle?
Please provide more details so members can evaluate and discuss.