Biological process

positive regulation of p38 MAPK signaling, positive regulation of p38 MAPK signalling, positive regulation of stress-activated MAPK signaling pathway, positive regulation of stress-activated MAPK signalling pathway, positive regulation of stress-activated MAPKKK cascade, positive regulation of stress-activated MAPKKK signaling pathway, positive regulation of stress-activated MAPKKK signalling pathway, up regulation of stress-activated MAPK cascade, up-regulation of stress-activated MAPK cascade, upregulation of stress-activated MAPK cascade

Any process that activates or increases the frequency, rate or extent of signal transduction mediated by the stress-activated MAPK cascade.