MUMBAI: Singer Avril Lavigne marked her 31st birthday by launching a global campaign to raise funds for those who are struggling with Lyme disease.

The ‘Girlfriend’ crooner, who herself suffered a severe case of the disease, took to Twitter to promote the cause.

Help me support people with Lyme disease w/ @AvrilFoundation and you could be in #CharmingwithAvril! http://t.co/vT29pLwgOE

— Avril Lavigne (@AvrilLavigne) September 28, 2015

The five-week campaign, which commenced on Sunday, will end on 9 November and a grand prize winner will be randomly chosen to spend time with Lavigne, reports people.com.

The winner will also have a speaking role in upcoming animated film 'Charming', which features the singer as the voice of Snow White.

"I am excited that this year's campaign is supporting people with Lyme disease and helping others to better understand the issue. My fans are always so supportive and ready to give back; I look forward to coming together for an issue that is so close to me," Avril said in a statement.

In a video posted on YouTube, she also thanked her fans for their support "through everything."