Damage to the frontal lobe can cause increased irritability, which may include a change in mood and an inability to regulate behavior.

Chronic sleep disturbances can cause irritability, inability to concentrate, depression, and anxiety.

Taking marijuana along with Disulfiram can cause agitation, trouble sleeping, and irritability.

At low levels, mercury exposure can cause irritability and vision and hearing problems.

The condition is known to cause irritability, low energy, headaches and to make muscles seem weak: all symptoms consistent with Beethoven's.

Ritalin is also relatively expensive - $9.45 for an average adult's weekly supply - and can cause irritability.

They may also cause insomnia or irritability and restrict urinary flow.

It might cause irritability and increased bowel movements in nursing infants.

This product has no known nutritional value and may cause irritability or wakefulness in some individuals.

Allergy medicines can cause appetite changes, low energy, and even irritability.