Cancer mum's joyful reunion with toddler son

James and his mum Laura reuniting after three weeks apart.
James and his mum Laura reuniting after three weeks apart. Photo: YouTube

They say hugs can help treat any ailment - and if that's true, little James Martancik is doing his bit to help his mum beat cancer.

A heart-warming video shows the two-year-old excitedly embrace his mother Laura after she returned home from hospital.

The single mum from Hawaii has Hodgkin's lymphoma, and was reunited with her son after undergoing six days of intensive chemotherapy treatment.

Little James had been staying with his aunt in Connecticut and was ecstatic when his mum returned.

The clip, which was uploaded to YouTube by Ms Martancik's sisters, shows the toddler running and throwing his arms around his mum before holding onto her tightly.

Ms Martancik then puts her son down and he backs up before taking another delighted leap into her arms. 

"What did I tell you?" Ms Martancik says to her son. "Mummy always comes back! I'm all back from the doctor."

Ms Martancik has been battling Hodgkin's lymphoma since July 2013. She had been in remission but the cancer returned last September

She told Today.com her son was the only thing she could think of while in hospital, and described being united with him as "the best feeling in the world."

"When you're sitting there alone, you feel like you're never going to make it and all you want to do is be home with your baby," she said.

Although Ms Martancik has now returned to hospital to prepare for a stem cell transplant, she hoped the video would show others undergoing cancer treatment there is light at the end of the tunnel.

"It's really important to stay positive and to stay happy," she told Today. "People need to know you do make it out, you really do get to go home."