@cmsmith10:A weak or thready pulse can be cause by a number of conditions. Symptoms that normally accompany a weak pulse can be fainting, dizziness, weakness, sweating, fatigue, or weight gain. The most common cause of a weak or thready pulse is low blood pressure. It can be caused from a loss of fluids or blood, malnutrition, vomiting, dehydration, or medication overdose. Anything that diminishes the forward flow of blood can produce a weak pulse.
Congestive heart failure is often association with a weak pulse. A diseased heart is not able to pump sufficient blood or oxygen to the rest of the body. This can cause a backup of blood in the heart and lungs. In this case, the pulse is likely to be weak or faint.