This paper presents a review and analysis of the possible use of plasmonic gold nanoparticles (GNPs) for theranostics and methods for increasing the most important GNP parameters which are Raman scattering for studying Raman spectroscopy (SERS) and converting light energy into surface heating energy for photothermal therapy (PT). The purpose of this study is to find the condition under which we can obtain the maximum conversion of light energy into heat for PT and at the same time receive a sufficient signal for detecting SERS by examining and analyzing the details of existing works about modified plasmonic nanoparticles. Also, to evaluate the significance of this study for the application of theranostics and the improvement of the quality of cancer tumors treatment. Research methods will include the study, analysis, synthesis, comparison of scientific literature on the topic of the article