This condition can cause low energy and poor concentration.

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

This causes energy to be stored in the stick as it flexes against the ice.

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

Comment: This medicine has caused low energy (even after a good nights sleep), muscle and joint pain which seems to be increasing.

Several commented on the lack of free time, especially at lunchtime, causing energy to flag.

This resistance, called copper losses, causes energy to be lost by heating up the wire.

Sound is created when the vibration of material bodies causes energy to propagate in pressure waves through a medium, usually air.

These substances (sometimes called "uppers") typically cause heightened alertness and energy.

Beta only lasts about two minutes per three hours and waking up at this point will cause energy to surge in the body.