Taylor Swift thinks it is ''impossible'' to always be positive.

The 'Blank Space' hitmaker reached out to a fan named Emily after reading a post on social media in which the youngster spoke of how the 25-year-old singer's music helped her cope with her congenital heart defect and subsequent operations and sent her the ''biggest hug''.

Posting after her Barclaycard British Summer Time show in London's Hyde Park on Saturday (27.06.15), she wrote: ''I think it's amazing that you're so honest about how it's affected you.

''It's impossible to be positive all the time about something that completely terrifies and confuses you, and I'm glad you're not putting that kind of weird pressure on yourself.

''Sending you the biggest hug from my hotel room, where I've just raided the snack bar and eaten everything in the style of a raccoon rummaging through a trash can.''

And Emily later admitted she was ''grateful'' for her icon's kind words.

She told E! News: ''What she said to me was so incredibly kind and almost unbelievable, and I can't believe she replied with such empathy and understanding.

I'm so grateful for what she said. It means the world to me.''

The young fan is now hoping for the chance to get a face-to-face meeting with the 'Shake It Off' singer.

She wrote on Tumblr: ''You told me that you were 'sending me a hug' so let's make this picture and that hug real! I can't wait to see you on July 24th and 25th(:.(sic)

Taylor responded after Emily shared details of her condition and wrote about how the 'Love Story' hitmaker had helped her through her ordeals.

She wrote: ''n light of all my confusion, i've found someone whose made all of these blurry lines become clear and i want to thank you for that.. taylor, you've made each and every long hospital visit, echo, ekg, iv, etc., easier, and i am so so incredibly grateful for that. you allowed me to be accepting towards the condition that i have and i'm so unbelievably thankful for that... love you always, emily.(sic)''