This is part of the healing process. This is the course of restoration from disease back to health.
All disease is self-limited.
If the disease is suppressed by whatever means, one either accommodates to it or dies. The initial disease, acute, lasts minutes, hours, days or weeks. The suppressed disease becomes chronic, i.e. lasts months, years or a lifetime. The initial fight against the acute disease is a reaction of the body to excrete the bodily toxins. Concomitant with this reaction of the body to the acute disease, the sick person will get various subjective, conscious symptoms.