AceShowbiz -

As chiseled as he looks, Colton Haynes admits that he is fragile inside. The former "Arrow" actor says he has been hospitalized for anxiety issues several times and it's something that he has struggled with since he was in 5th grade.

Haynes poured out his heart in a series of Twitter messages on Tuesday, December 1. "For those of you who are suffering with intense anxiety ...ur not alone," he wrote along with a link to an Upvoted article about anxiety and social status. "It's been a constant struggle for me since 5th grade. It's a battle."

He continued, "Whether it be fainting, hyperventilating, or seizures ... I've been through it. Just know ur not alone & it affects more ppl than you would ever know. We can overcome this. We can fight thru it & will."

Haynes said anxiety was not something to be taken lightly. "I've quit jobs because of anxiety, flaked on social events, family gatherings, birthdays, important movie/work tests. Its a serious problem," the 27-year-old wrote.

He encouraged fans who don't have the issue to "be there" for someone who does. "It's not a case of 'being dramatic'," he wrote, "...its a life long struggle. Love those suffering. Anxiety has caused me to be extremely agoraphobic & livin in constant fear of leavin my house at times. Ur not alone."