Lately, I have been experiencing intense numbness in my left arm and hand when I wake up in the mornings(every morning). It is similar to when your hand or arm falls asleep, but much much more prominent and long-lasting. Occurs slightly during the day sometimes but is worse in the mornings and mainly in left arm and hand.
Numbness in the arms (or hands) in the morning is frequently due to the pressure your body creates on the arm during sleep. Prolonged pressure on the nerves of the arm usually cause temporary nerve dysfunction that can manifest with numbness, pain, tingling or paresis. This is a banal but also very common reason for your symptoms.
Other causes for a numb hand or arm could include various neuropathies due to a number of disorders (that are not typical for your age in their early twenties). Nonetheless, you can consult a neurologist to identify the real cause for your symptoms.
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