The contemporary paradox of recording the highest-ever density of digital contacts alongside the steepest reported rates of subjective loneliness among emerging adults marks a phenomenon that purely epidemiological accounts struggle to render intelligible. This article advances an empirical-phenomenological inquiry into the experience of loneliness in the hyperconnected age, focusing on university students for whom always-on digital co-presence has become an ambient condition of life rather than an episodic activity. Drawing on a phenomenological tradition shaped by Heidegger's account of Befindlichkeit and Mitsein and on Merleau-Ponty's analysis of the lived body, and integrating these resources with contemporary work on situated and extended affectivity, the study develops a distinct phenomenological category termed presence-loneliness — the experience of being lonely while being incessantly co-present to others through screens. Methodologically, the inquiry combines a structured review of recent peer-reviewed literature on loneliness, social media, and phenomenology with a hypothetical-illustrative qualitative dataset of twenty-four semi-structured interviews with undergraduate students aged 19 to 24, analysed through Interpretative Phenomenological Analysis. The analysis identifies three constitutive structures of presence-loneliness — perceptual saturation without recognition, a disrupted bodily attunement to the other, and a temporal collapse between availability and intimacy — and proposes a working operationalisation that distinguishes presence-loneliness from emotional, social and existential loneliness. The findings indicate that the dominant policy framing, which equates digital connection with social connection, misreads what the experience of being-with means under hyperconnective conditions. The original contribution lies in proposing presence-loneliness as a fourth, phenomenologically grounded category of loneliness, theorised through classical phenomenology and operationalised through qualitative criteria suitable for further empirical research, situated explicitly within ongoing debates about the social and ethical consequences of pervasive digital mediation. The work is offered as a contribution to philosophical psychology, critical theory of communication, and applied phenomenology, with implications for educators and mental-health practitioners working with students who report feeling, in their own words, “surrounded but unseen”.