Why are the veins in my hands bursting? what causes this?

Swollen hand veins.: Hand veins can swell for many reasons but the most common is certainly hereditary . Other factors would be level of hydration, aging, sun exposure and loss of elasticity. I doubt at age 32 that aging is a factor for you. Actually, I am amazed at the amount of women that i see with bulging hand veins. They can be easily treated with laser or sclerotherapy and usually a combination of both.

Weakened vein walls: It is normal for hand veins to become thinner (and therefore more prone to bruising marks, i.e."bursting") as you age. The skin overlying the hand veins also thins rather dramatically with older age, making the veins more prone to bruising w/ mild trauma. Blood thinners, such as Aspirin or plavix, (clopidogrel) increases the incidence of this. I expect the veins are not "diseased" and should not be treated.