abdominal pain, anorexia or/and weight loss, attention difficulties, burning or/and flushing, chest discomfort, chills, diarrhea, dizziness, dry mouth, dyspepsia, fatigue, heaviness, injection side reaction, insomnia, language difficulties, memory difficulties, nasal signs and symptoms, nausea, numbness, paresthesia or/and tingling, pharyngitis, somnolence or/and drowsiness, stinging or/and pressure sensation, taste disturbance, tinnitus, upper respiratory tract infection, vomiting, weakness
Most interestingly, the side effects of a sugar pill depend on what illness it is “treating.” And they resemble the side effects of the active medicine the placebo is standing in for. Mindhacks offers the most likely explanation.
One explanation may be that before taking part in a clinical trial, patients are informed of the possible side-effects that the active drug may cause, regardless of whether they are going to be given placebo or the actual medication.
Another is that getting better by itself has side effects. The theory would be that the body adjusts to the illness in certain ways and recovery is followed by undoing those adjustments, the physiological effects of which appear to be side-effects of the medicine.