ADHD has been researched for over 40 years and there is an overwhelming body of scientific evidence to support its diagnosis. Although social factors and child -rearing tactics have been indicated, the evidences against are not compelling enough.
Some of the more substantial
triggers that lead to ADHD are as follows-
Environmental factors - Some evidences point towards the role of environmental factors in causing ADHD.
Cigarette smoking and
alcohol usage during pregnancy are indicated as risk factors. Hence it is advisable to refrain from these practices while pregnant.

Presence of
Lead in young children is reported to cause ADHD

Studies on twins showed that
genetics plays a key role in attention disorders /ADHD. Studies show that 25 % of the close relatives of ADHD- affected children also have the disease, while the rate is just about 5% in the general population.

A small percentage of ADHD-affected children have been found to have suffered a traumatic
brain injury

It has been indicated that the symptoms of attention disorders are further fuelled by
refined sugar and
food additives