They can move, cause pain and again remain in a position for long periods of time. Similarly chronic
appendicitis too can behave this way with bouts of pain, localization of
infection and inflammation and a symptom free period. Crohn’s disease, diverticulitis, infection in kidney, constipation, and an abscess in rectus abdominis muscle or psoas muscle can all cause lower right abdomen pain. An ultrasound or CT scan of abdomen is definitely required.
Hope this helps.