Aortic Regurgitation: This condition, where the aortic valve doesn't close properly, can cause a prominent, visible pulsation in the neck due to the increased volume of blood ejected with each heartbeat. The "jumping beat" or "Corrigan's pulse" is a classic sign.

Hyperthyroidism: An overactive thyroid gland can lead to increased heart rate and force of contraction, making the pulse more visible and forceful.
Anxiety or Stress: Increased sympathetic activity can cause tachycardia and increased cardiac contractility, potentially making the pulse more noticeable.
Aortic Stenosis: Although less likely to cause a "jumping" pulse compared to regurgitation, severe stenosis can lead to a prominent pulse due to the increased force of contraction needed to overcome the obstruction.

Aortic Dissection: A life-threatening condition where the inner layer of the aorta tears, potentially leading to a sudden, severe change in pulse character. Early recognition is crucial.
Cardiac Tamponade: Fluid accumulation in the pericardial sac can compress the heart, leading to a decrease in cardiac output, but the initial presentation might include a visible, forceful pulse due to compensatory mechanisms.
Severe Anemia: Significant reduction in red blood cell mass or hemoglobin can lead to a high-output state, with an increased, visible pulse as the body attempts to maintain oxygen delivery.

Patent Ductus Arteriosus (PDA): A congenital heart defect where the ductus arteriosus fails to close, potentially leading to increased pulmonary flow and a bounding pulse.
Beriberi (Thiamine Deficiency): A condition that can cause high-output heart failure, leading to a visible, forceful pulse due to the body's attempt to compensate for the deficiency.
Arteriovenous Fistula: An abnormal connection between an artery and a vein can cause a localized increase in blood flow, potentially leading to a visible, pulsatile mass or a "jumping" pulse in the vicinity of the fistula.