Blue painful spider veins on right arm extending to palm. Wrist hurts when moving. Can chlorella herb cause this since it has lots of vitamin K in it?

Sounds more serious. This sounds serious and should be evaluated by a vascular or hand surgeon.
No. You have another problem. The use of blood thinners which are vitamin-k dependent do not cause spider veins, nor do theseause wrist pain. Something else is going on.....!
No. You should see a surgeon who has an interest in vascular malformations.
No. Chlorella is a waste of money promoted by using broad claims that are not valid. But, no, your problem is not caused by Vit K, nor is it caused by chlorella. The remaining question is why the pain in your arm? Since there are numerous contenders for a diagnosis you need to consider a visit to a medical professional.