When a carer is not supported it has a "knock on effect" on the patient, warned the chief executive of Macmillan Cancer Support.
Ciarán Devane wanted to see the duty placed on local authorities to identify carers in the care bill extended to the NHS as well.
The care bill already contains proposals designed to support carers, the care minister has said.
Norman Lamb agreed with Macmillian Cancer Support, that carers made "a huge contribution" to the UK, but continued with plans to have them identified by the local council, rather than the NHS.
Serious changes should be made the to care bill, currently making its way through Parliament, to better support carers, a leading health charity has said.
Ciaran Devane, chief executive of Macmillan Cancer Support said it was "nonsensical" that the care bill places a legal duty solely on local authorities to identify and support cancer carers.
Carers are feeling increasingly vulnerable because they have not had enough training on the basics, like changing bandages or administering injections, a leading health charity found.
One such carer, Pamela Digney, from Lincolnshire, spoke to Macmillan about the challenges she faces looking after her husband Roy, 75, who had cancer removed from his spine:
Macmillan Cancer Support surveyed over 2,000 carers to find out how they were coping with helping to treat a patient on a day-to-day basis.
The health charity found:
- Of those with no or inadequate training, 63% had been left feeling distressed.
- And 50% said caring for a loved one with cancer left them feeling frightened.
- Over one in three, 34%, worried their loved one would need to take a trip to the hospital.
- Of those who perform healthcare tasks, 36% have had to urgently call a doctor or 999 to get support or advice on how to help the person they care for.
Carers tending to a cancer sufferer are performing tasks they are not trained to do properly and often feel overwhelmed, a leading health charity has found.
Around 240,000 people care for a cancer patient who will require injections, a catheter and a change of bandages but 53% of those say they have had little or no instruction from a healthcare professional.
One in five, 21%, cancer carers who had received some training said it was not enough.
Macmillan is now calling for changes to be made to the care bill, which was discussed in the House of Lords last week, to ensure the NHS in England supports cancer carers.
Commenting on research conducted for Macmillan Cancer Support, Jane Cummings, NHS England's chief nursing officer, said: "I am committed to taking action to make sure that all patients receive the highest standard of care and that they are always treated with compassion and dignity.
"Our Compassion in Practice strategy sets out exactly how we can deliver the '6Cs' - care, compassion, competence, communication, courage and commitment. These are the core elements of our vision."
She said compassion "comes naturally to the overwhelming majority of staff," but added: "Sadly some people do not have the capacity to be compassionate and caring despite training and support. They have no place in the NHS.
"We only want staff who come to work to make a difference for their patients and are prepared to take personal responsibility for individuals in their care."
Research commissioned by Macmillan Cancer Support, of 2,217 adults living with cancer about their hospital treatment found a "lack of basic care, dignity and respect" for some patients, according to the charity.
A YouGov survey, commissioned by Macmillan Cancer Support, of 2,217 adults living with cancer found 18,000 patients have their medical files lost every year in hospitals.
Other findings of the poll included:
- Just over one in five patients had felt patronised by hospital staff
- 15 percent of patients said they had felt humiliated by the nurses treating them at some point
- 14 percent of cancer patients who requested help to go to the toilet said they were forced to wait at least 30 minutes for assistance
Around 18,000 cancer patients have their medical files lost every year in hospitals, according to Macmillan Cancer Support.
A poll for the charity found 11 percent of cancer patients admitted to English hospitals every year have their medical file lost by a doctor or nurse.
The charity estimates around 18,000 of the 170,000 patients admitted to hospital have their file lost, which could impact on treatment.