Factors causing self regulation problem in Asd are physiological and genetics, which can be discussed by medical doctors. With respect to Physical systems Children with ASD tend to engage in sedentary play and repetitive behaviours which do not challenge the body or allow the muscles to build. As a result they tend to have poor muscle strength especially in the upper body. sensory modulation Problems are common in children with ASD and can affect their ability to taste, smell and texture of food, as well as the feel of clothing against the skin, the sound of hair clippers near the ears and sensation of nails being clipped. Sensory modulation is also a factor sleeping control. Sensory modulation is also a factor in their poor sleeping behaviours and poor bowel and bladder control, other physiological factors may play a part as well. Visual processing is often a strength in the same children and many successful intervention such as visual schedules make use of that strength, sensory dysfunction symptoms often decreases naturally as a child develops. Many sensory strategies and therapy can successfully decrease remaining sensory symptoms. Some children with ASD, have rigid eating behaviours. They may for example, eat only nonvegetarian or vegetables . This is a separate problem from sensory based picky eating. The sensory specialist or behaviour Therapist can work on these areas