The phrase "problems have risen" is correct and usable in written English.
It can be used to indicate that issues or difficulties have emerged or increased over time.
Example: "In recent months, several problems have risen that require immediate attention from the management team."
Alternatives: "problems have arisen" or "issues have come up."
That might seem to raise ethical concerns, but the people who regulate and monitor drug experiments say that no problems have risen so far.
I spoke to Luke's sister, Natalie Jeffers, last month; not long after the latest Department of Work and Pensions figures showed benefit sanctions against people with mental health problems have risen by 600% over the past four years.
Due to this improper siting criteria, environmental and health problems have risen from old landfills that are located in residential areas.
Many modifications of important lifetime distributions have achieved the above purpose, but unfortunately, the number of parameters has increased, the forms of survival and hazard functions have been complicated, and estimation problems have risen.
As the population of students with psychological problems has risen, so have such encounters.
The survey notes that over the past several years, the number of drugs prescribed for cardiovascular problems has risen by about a fifth.
At the same time, the number of those in treatment for their addiction problems has risen by about a third from 23,500 in 1998 to 35,000 today – helped by a substantial increase in available beds, facilities and medical support – with many going on to methadone replacement programmes.
Speech and communication problems had risen as a special needs problem by 58% over the same period between 2005 and 2010.
Over the last five years, the estimated number of urban foxes (and their associated problems) has risen 500%.
However, at T3 the proportion reporting memory problems had risen to 59%, although concentration problems remained lower at 37%.
"My concerns about the corruption problem have risen".
