Depends on the type of crying.
When the pt. or family truly touches you, and you cry, that proves you are human. When I have built a repore(sp?) with a family, and then the beloved family member dies, I have showen them I am sad and even cried some. If I needed to cry lots, I would go away and not burden the family with that, but I think it's a comfort for people to see that their family member has touched their caregiver. It shows empathy.
When I've had a really rough night, a good cry or two at home, alone, is wonderful therapy. When sad or upsetting things happen, crying is a way to heal, to let the emotion out. The Lord knows we see lots of sad and upsetting things in our jobs.
On the other hand, crying often for small reasons is a sign of too much stress or a sign of depression.
A few months ago some changes happened in my life that caused me to be much, much busier. I thought I was handling it well. Thought I had a good attitude and was taking care of everything, but I was crying easily, at dumb stuff sometimes. One night I had a hard, busy night at work, and I wasn't getting the help I needed, so I burst into tears at the nurses' station. That was embarrassing, and I realized if crying is interferring with my job, I needed help. I changed a bunch of stuff in my life to lower my stress. Now, if I cry, it's back to being appropriate and controllable.
I guess you could ask yourself, is your increase in crying interferring with your life? Do you embarrass yourself by crying at little things and other people don't understand? If so, then maybe you need to de-stress your life (not easy!) or look into whether you may be depressed and not recognize it.