2nd most common focal mononeuropathy
Results from compression of<unk>  nerve either at elbow (cubital tunnel) or wrist (Guyon's canal)
Compression at elbow more common<unk>  nerve provides cutaneous sensation to the 5th digit and<unk>  side of 4th digit and motor innervation to flexor carpi<unk> is, flexor digitorum profundus, hypothenar, interossei, and adductor pollicis muscles
Etiology: Intrinsic/extrinsic compression, trauma, more rarely infectious or vasculitis
Compression at elbow more common
Male > Female
Increasing age
Smoking
Cyclists (handlebar palsy)
Ulnar neuropathy
C8/T1 nerve root lesion
Anterior interosseous neuropathy
Medial cord brachial plexus lesion
Long thoracic neuropathy
Diabetic neuropathy
Posterior interosseous neuropathy
Amyloidosis