This article talks about how having a social phobia or social anxiety can have a genetic aspect to it. The problem might be with serotonin and having too much of it in your system. It turns out that if there is a mutation, a single nucleotide polymorphisms (SNPs), in the gene that lowers the amount of serotonin. Then the individuals will slowly become more afraid and saddened if nothing is done about the build up of serotonin. I believe this is a situation is relate-able to a lot of people. Also with something like social phobia or anxiety, the more information you have the better and it can be something to lesson the stress of the ones who are really affected.
Medical News Today