Yes, taking Humalog may cause stomach-related side effects. For example, nausea and diarrhea were less commonly reported side effects in clinical studies of Humalog.
However, side effects that affected the stomach weren’t reported by people taking Humalog Mix75/25 or Humalog Mix50/50 in clinical studies.
If you have concerns about stomach-related side effects while taking Humalog or Humalog Mix, talk with your doctor or pharmacist.