Final answer:
The sudden onset leg pain described could likely be caused by Peripheral artery disease (PAD), where decreased blood flow due to plaque accumulation causes pain. However, other conditions like deep vein thrombosis or sciatica could also be responsible.
Step-by-step explanation:
The possible cause of sudden onset leg pain in the setting of an irregularly, irregular interval could be an indication of Peripheral artery disease (PAD). This condition develops when plaque accumulates in the walls of leg arteries leading to a decrease in blood flow which can cause intermittent pain, especially when walking.
It is imperative to correctly diagnose PAD as it may be a sign of more severe atherosclerosis that could lead to a heart attack or other complications if left untreated. Other potential causes for sudden leg pain include conditions such as deep vein thrombosis (DVT) where blood clots form in the deep veins of the legs or sciatica, where there is inflammation or compression of the sciatic nerve. Conditions such as muscle strain, arthritis or nerve compression can also cause leg pain but are typically associated with different symptom patterns or histories than PAD.