SOS chief executive Gasper Tan said the majority of clients are between 10 and 29 years old. Not all issues raised relate to the pandemic.
In the West, health experts are concerned about the reportedly increased consumption of alcohol and drugs to cope with the stress of the pandemic.
Dr Chee said: "Illicit drug abuse may actually go down due to less access from reduced travel and border traffic, but we may need to look for increased alcohol and prescription drug abuse."
To deal with the anxiety-provoking uncertainty of the pandemic, it helps to focus on the present while you look to the future, advise mental-health experts.
The Institute for Disaster Mental Health at the State University of New York at New Paltz said in an advisory people should find things they enjoy and appreciate every day, rather than waiting for happiness at the end of the pandemic.
Dr Goh stressed that people should seek help now if they need it, instead of waiting. "Help can come in many forms, starting with talking to loved ones about your struggle and anchoring yourself with self-care measures.
"Looking at the second and third waves of infection happening elsewhere, there is a possibility we are in the eye of a storm that is yet to blow over. At this stage, it is important to take stock and stay vigilant."
As the situation can change, people need to be flexible and respond to changes, he added.
Another useful tip is to take things one step at a time.
The Mental Health America's advice for coping with disaster: "For people under stress, an ordinary workload can sometimes seem unbearable. Pick one urgent task and work on it. Once you accomplish that task, choose the next one.
"Checking off tasks will give you a sense of accomplishment and make things feel less overwhelming."
People can also do something positive such as donating blood or helping others, which can give them a sense of purpose in a situation that feels out of control, it said.
SOS' Mr Tan said: "Being mindful of one's mental state allows us to check in with ourselves regularly during this difficult period and to seek support early before our emotions become destabilising and overwhelming.
"Loved ones should check in regularly with those around them and show genuine concern without judgment. The effects of the pandemic may affect different groups of people disproportionally."
On when to seek help, Dr Chee said: "If you are having significant anxiety or distress for at least two weeks, if it is consistently affecting your sleep, and especially if you start feeling a sense of hopelessness and helplessness, it's time to seek help."
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