Arthur’s symptoms were diagnosed as a virus, asthma or anxiety
A mum says a doctor dismissed her 10-year-old son’s sudden weight loss and struggle breathing as ‘anxiety’ – only for it to turn out to be cancer. Penny Saltmarsh took her ‘healthy and football mad’ son Arthur to see a doctor in January 2025 when he became breathless, but was told he just had a viral infection that would clear up.
When Arthur’s symptoms worsened as he began losing weight and ‘gasping for air’ during the school run, a week later, the 41-year-old took her child for an appointment twice more. When a doctor saw that Arthur struggled to make eye contact, Penny claims his sudden weight loss was diagnosed as ‘anxiety’, and she was told he was just an ‘anxious child’, with the doctor opting not to do an X-ray.
Days later the mum-of-six and her husband ‘panicked’ when they noticed one side of Arthur’s chest was four times bigger than the other so rushed him to hospital. In hospital an ultrasound revealed Arthur had a large build-up of fluid around his lungs causing them to collapse and his heart was under strain due to a mass on his thymus, a small gland in the chest.
Penny says it was a ‘nightmare’ to discover her child had T-cell lymphoblastic lymphoma in February 2025, which is a rare and fast-growing type of blood cancer. Arthur received four rounds of intensive chemotherapy between February and October 2025 and the mass in his chest has now gone but he will continue receiving treatment until June 2028.
A family member has set up a GoFundMe account to help support Arthur’s family, whose lives have completely changed since the diagnosis. The full-time carer says she is ‘grateful’ she trusted her gut as she claims a doctor said her son was just 48 hours away from death.
Now she urges other parents to ‘advocate’ for their child if they suspect something is wrong. Penny, who is from Cambridgeshire, said: “It happened in two or three weeks that he went from being healthy and fit to being two days away from dying.
“He started off with just becoming really breathless so even walking up the stairs he would stop halfway and just be struggling to catch his breath. That concerned us a little bit because prior to that he was the most fit, active, healthy football mad boy.
“At this point I wasn’t too concerned but I took him to the GP. She said she thought it was viral and that ‘he’ll get better in about a week’.
“A week later he was getting worse and he’d also lost weight as well. He’s not one to enjoy going to bed but it got to 5.30pm and he’d be taking himself to bed and that definitely rang alarm bells because he’s never been like that ever.
“We took him back to the GP and I said ‘if it was viral he’d be getting better but we’ve noticed he’s losing weight, he’s out of breath so much and walking to school he’d have to stop gasping for air’. She said it could be asthma and sent us home with a peak flow kit and a diary. We did it for about a day but he couldn’t even blow the peak flow.
“They invited us on Saturday to a respiratory clinic to do an asthma check. The reading came back that it was very unlikely to be asthma. We took him home and a few days went past and we started to really worry at this point but I never in a million years thought about cancer.
“It’s just something you think happens to other people. You don’t ever think it’s going to be your child. We took him back to the GP and she said it was anxiety because he was not able to keep eye contact. Arthur can be a bit of an anxious child and has inattentive ADHD and autism. He’s really popular at school and is really good at fitting in but he doesn’t like to stand out from anybody.
“I also asked if we could do an X-ray or something because I felt like there was something going on with his chest. She said ‘no, I don’t want to send him for any X-rays because I don’t want to expose a child to any unnecessary radiation’.
“Me being trusting I just thought ‘okay, we’ve seen the GP quite a few times, we’ll just take him home and see how we get on’. [On] Sunday morning he came into our bedroom and you could see the level of effort he was having to do just to breathe.
“We started to panic at this point and his dad said ‘we’re taking him to hospital’ and he turned around and one side of his chest was four times the size of the other.”
In hospital an ultrasound revealed that over three litres of fluid had built up around Arthur’s lungs and an urgent CT scan showed the pressure had pushed his heart to the other side of his body. Doctors said it was too risky to put him under general anaesthetic so they were forced to sedate him to drain some of the fluid.
Penny said: “I honestly thought I was in a dream. I thought ‘this isn’t real life’, it was like a nightmare. It was really, really hard.
“In the beginning I was cross. He’s always been quite stoic so puts on the brave ‘I’m fine’. How do you tell your child they have cancer?”
Following four rounds of successful chemotherapy Arthur must now receive maintenance chemotherapy until June 2028 and Penny had to quit being a student midwife to care for her son. Penny said: “He’s been through a lot and is so tough. The lasting mental impact that it’s had is what we’re struggling with now.
“He’s missed a year of school and he just wants to be like everybody else at his school. Just getting him back to being Arthur before all of this has been a real challenge.”
She added: “If you feel in your gut that you’re not happy or if you have alarm bells going off in your head you push. That’s your child and you’re there to advocate for them.”
You can donate to Penny Saltmarsh’s fundraiser here https://www.gofundme.com/f/pkcjm-support-arthur-through-his-cancer-journey









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