Some individuals that self harm may go on to complete a suicide attempt. It is unlikely however that self harm is the cause of such suicidal feelings. It is far more likely to be due to the reasons triggering the self harm, such as abuse, bullying, financial worries etc. rather than an extension of the self harm itself.
A survey of 758 respondents carried out by NSHN showed that only 4% of these individuals stated that it was suicidal feelings that led to any of their individual incidents of self harm (Figures correct to August 2017). The feelings most often reported were self hatred, anger, frustration, worthlessness