The correlation between OCD and being sensitive may apply only to some people. There is no clear evidence that highly sensitive individuals are prone to the disorder, although one of the symptoms indicate sensitivity to be a major factor. For instance, one may begin to obsess over hygiene as they fear being contaminated or infected with bacteria at home, so they start washing their hands repeatedly or attempting to maintain the cleanliness of the house. They are sensitive to any foreign substance present within their surrounding environment.
In Islam, we must sustain purity before prayer. That means performing ablution or a full body ritual purification that is called 'ghusl'. Nevertheless, one may start developing doubts as to whether they are truly purified. Women may have doubts about discharge whilst men may begin to worry about excreting semen. Perhaps their clothes were impure, or that they passed gas during prayer. It could lead to repeatedly showering, performing ablution or using the bathroom more frequently. For the individual it is undoubtedly stressful and can lead to physical health problems, such as dry skin and hair as well as acne.
The flashback memories of my past childhood always affects me till this day. I was born as a sensitive and naive child. Sensitivity is that one trait people often despise, even the carriers of it. I was faced with difficulties for self acceptance, because not only did I loathe my self for my overreacting personality, I was a victim of fat shaming. I wanted to feel happy, free of worries by claiming my desires. But unfortunately we do not live in a Utopian world; not everything we wish for can be granted, unless we choose to put the effort. I definitely take it to heart if someone still fat shamed me, even if it was merely a 'joke'. It evokes all my memories of self loathe, where I was rather too young to be feeling insecure followed by wasted effort from dieting and physical activity. We dislike being called sensitive despite us being fully aware. We refuse to admit our behaviours because we choose to not be defined by it. We feel weak, with no self control towards our impulses. When these emotions begin to overwhelm us, our mental health deteriorates. We feel violated if one makes a remark, which leads us being defensive.
One must also understand that sensitive people can vary. Some are just easily emotional and have deep empathy, whereas others I previously mentioned have the tendency to take everything so personal. Normally these individuals have insecurities followed by low self esteem and hence their weakness is criticism. They are not skilled to ignore varying perceptions because they choose to listen to them and not their own conscious mind. It is the fear of judgement that they may receive.
You may be wondering about its relevance to scrupulosity, but in some form it plays a role. Again, it is not necessarily the cause of the disorder and this is only an elucidation of my own personal experience. I investigated within myself and realised that one of the triggers towards OCD was my highly sensitive personality. Followed by the altering chemical changes, my overreactions led to repetitive self harm out of guilt and loathe. My personality may have been a stepping stone towards the disorder; the smallest of things I felt was a grave sin and through time it only had gotten worse.
Do not let others define you, a very important lesson that I wish I had grasped years ago. People like to manipulate and make you feel bad, even though you may be the victim. That does not mean you should play its role, rather you should only believe in what your heart feels right. Sometimes we know that our very own mind controls us too and causes us to react or act in ways we regret later, but do not let the past define you. Every now and then I feel hurt from my own levels of faith, because when you have that love and dedication to the Lord, the judgements you receive will become meaningless.