A dossier containing "shameful" stories about the care elderly patients receive in NHS hospitals in England has been published by campaigners.
The Patients Association said the 16 cases include people being denied pain relief, left to sit in their own faeces and going without food and drink.
It comes after criticism from other groups and the charity said it was highlighting the tip of the iceberg.
The government said it was determined to "root out poor performance".
A programme of unannounced inspections would continue, the Department of Health added.
Last month the Care Quality Commission attacked hospitals for what the regulator said were "alarming" levels of care.
The Health Service Ombudsman also raised concerns about the issue in February, reporting that nearly a fifth of complaints it got were related to the care of the elderly.
As well as highlighting the 16 cases, the Patients Association said the number of calls to its helpline regarding care on hospital wards had already hit 961 this year - a third more than the total made throughout the whole of 2010.
The Patients Association said the failings fell into four broad categories - communication, assistance going to the toilet, pain relief and nutrition.
And it called on NHS trusts to sign up to a pledge to ensure these four areas of care become top priorities.
It said responsibility for the problems lay with everyone from individual staff on the wards to senior managers on the board.
Among the cases highlighted are a patient who was left sitting in his own faeces for hours after a nurse told him he should empty his bowels in his chair because she did not have time to help him go to the toilet.
In another case, a family of a patient had to beg for pain relief for a dying woman before waiting for nearly two hours for help to arrive.
And one man had to wait for 15 minutes to have his call buzzer answered despite having to desperately struggle for breath.
It is the third time the Patients Association has published individual stories like this.
Katherine Murphy, the charity's chief executive, said: "We cannot ignore the fact that some trusts are not even paying lip service to the fundamentals of care.
"The issues we continue to highlight are human rights issues. They show a lack of compassion and care and a shameful attitude to treatment of the elderly."
Peter Carter, general secretary of the Royal College of Nursing, said the patients had been "clearly failed" in the cases highlighted.
"Each and every nurse is personally accountable for their own actions and must act promptly to raise concerns if staffing levels or other pressures get in the way of delivering good patient care."
But he also said managers must take responsibility, pointing out that job cuts were making it more difficult to provide good care.
The publication of the Patients Association report has also coincided with an announcement by the government that it is looking to improve standards for healthcare assistants, who are providing an increasing amount of care on wards.
These staff are currently unregulated, but the Department of Health is looking to introduce new rules by 2013 to ensure that they reach a minimum training levels before being allowed to work. However, indications are that this will be a voluntary requirement, which has disappointed some.
A spokesman for the Department of Health said: "The Patients Association is right to raise these examples and issues, and we will work with them and with the NHS to sort these problems out."