Attachment relates to the connection a child experiences with its caregiver. This initial relationship between self and others serves as a blueprint for all future relationships (Bowlby, 1975).
Attachment issues refer to the difficulty a person has in establishing and maintaining long lasting relationships. Some causes of attachment issues include neglect/abuse, separation from primary caregiver, through circumstances, and parent mental illness.
Therapy provides a safe space to work through these issues by helping you understand the causes of your difficulties and potential to recognise unhelpful patterns so these can be addressed.